Sentence Transformations for B2 First: Key Word Transformation Practice and Tips

If you are preparing for the B2 First exam, sentence transformations can feel like one of the trickiest parts of the Reading and Use of English paper.

You may understand both sentences. You may even know the grammar. But then comes the problem:

How do I rewrite the sentence correctly without changing the meaning?

That is exactly what sentence transformations test. They check whether you can express the same idea in a different way using accurate grammar, vocabulary, collocations and fixed expressions.

In the B2 First exam, this task is called Key Word Transformations. You are given a first sentence, a key word, and a second sentence with a gap. Your job is to complete the second sentence so that it means the same as the first one. Cambridge states that this task tests grammar and vocabulary by asking students to rewrite sentences with different words while keeping the same meaning.

Let’s look at how to do sentence transformations for B2 First step by step.

What are Sentence Transformations in B2 First?

Sentence transformations are sentences that you rewrite using a different structure.

You must keep the meaning the same, but you usually need to change the grammar.

For example:

Original sentence:

I haven’t seen Mark for three months.

Key word:

SINCE

Transformation:

It has been three months since I last saw Mark.

The meaning is the same, but the grammar has changed.

This type of exercise is especially useful because it helps you move from simply “knowing” grammar to actually using it flexibly. And that is exactly what Cambridge wants to see at B2 level.

How the B2 First Sentence Transformation Task Works

In the exam, you see something like this:

Complete the second sentence so that it has a similar meaning to the first sentence, using the word given. Do not change the word given.

Example:

I regret not studying harder for the exam.

WISH

I __________________ harder for the exam.

Answer:

I wish I had studied harder for the exam.

In this task, you must:

use the key word exactly as it is

keep the same meaning

write only the missing words

use correct grammar and spelling

avoid adding too many or too few words

The B2 First Reading and Use of English paper has seven parts and lasts 1 hour 15 minutes. Part 4, Key Word Transformations, contains 6 questions, with up to 2 marks available for each correct answer.

The Golden Rule: Do Not Change the Key Word

This is the first rule learners must remember.

If the key word is despite, you must use despite, not although.

If the key word is used, you must use used, not use or using.

If the key word is wish, you must use wish, not wished.

For example:

She started learning English five years ago.

BEEN

She __________________ English for five years.

Correct answer:

She has been learning English for five years.

The key word been stays exactly the same.

This is where many students lose marks. They understand the meaning, but they change the key word. In the exam, that usually means the answer is wrong.

Common Grammar Patterns in Sentence Transformations for B2 First

Sentence transformations usually test grammar patterns that appear again and again in B2 First. Once students recognise these patterns, the task becomes much less frightening.

Think of it like learning the old roads through a familiar town. At first, every street looks confusing. After a while, you know exactly where each one leads.

1. Present Perfect with For and Since

This is one of the most common transformation areas.

Pattern 1: Past simple → Present perfect

Original:

I moved to London in 2020.

Key word:

LIVED

Transformation:

I have lived in London since 2020.

Pattern 2: Last time → Present perfect

Original:

The last time I saw Anna was in May.

Key word:

SEEN

Transformation:

I haven’t seen Anna since May.

Useful structures:

have/has lived here for

haven’t seen him since

it has been three years since

this is the first time I have

Example:

This is the first time I have eaten sushi.

NEVER

I have never eaten sushi before.

If you need more help with this grammar area, read my full guide to the present perfect in English

2. Too and Enough

Too and enough are very common in B2 First sentence transformations.

Too + adjective + to

Original:

The box was so heavy that I couldn’t lift it.

Key word:

TOO

Transformation:

The box was too heavy for me to lift.

Adjective + enough + to

Original:

He isn’t tall enough to reach the shelf.

Key word:

SHORT

Transformation:

He is too short to reach the shelf.

Useful structures:

too expensive to buy

too tired to continue

not old enough to drive

strong enough to carry

Example:

The coffee was so hot that I couldn’t drink it.

TOO

The coffee was too hot for me to drink.

3. So and Such

Learners often confuse so and such, so they are perfect for sentence transformations.

So + adjective/adverb

It was so cold that we stayed indoors.

Such + adjective + noun

It was such a cold day that we stayed indoors.

Example:

The film was so interesting that I watched it twice.

SUCH

It was such an interesting film that I watched it twice.

Another example:

It was such a difficult test that many students failed.

SO

The test was so difficult that many students failed.

4. Passive Voice

The passive voice is another classic B2 First transformation area.

Active → Passive

Original:

They built this bridge in 1998.

Key word:

WAS

Transformation:

This bridge was built in 1998.

Passive with two objects

Original:

They gave Sarah a prize.

Key word:

WAS

Transformation:

Sarah was given a prize.

Passive with reporting verbs

Original:

People believe that the painting is very valuable.

Key word:

BELIEVED

Transformation:

The painting is believed to be very valuable.

This last structure is especially useful for B2 and C1 learners because it sounds more formal and academic.

Find more lessons and exercises on passive voice here

5. Reported Speech

Reported speech appears regularly in sentence transformations because it tests tense changes, pronouns and sentence structure.

Example:

“I will call you tomorrow,” said Tom.

PROMISED

Tom promised to call me the next day.

Another example:

“Don’t touch that button,” the teacher said.

WARNED

The teacher warned us not to touch that button.

Common reporting verbs:

promise to do something

warn someone not to do something

advise someone to do something

deny doing something

admit doing something

suggest doing something

Example:

“I didn’t break the window,” said Jack.

DENIED

Jack denied breaking the window.

Learn all about reported speech here and do the exercise

6. Modal Verbs

Modal verbs are extremely important for B2 First because they express obligation, advice, possibility, deduction and criticism.

Must, have to, should, might, can’t

Example:

I’m sure she is at home because the lights are on.

MUST

She must be at home because the lights are on.

Example:

It’s possible that he forgot about the meeting.

MIGHT

He might have forgotten about the meeting.

Example:

You shouldn’t have spoken to her like that.

OUGHT

You ought not to have spoken to her like that.

These transformations can be tricky because the meaning changes depending on the form:

must be = I am sure now

must have been = I am sure about the past

can’t be = I am sure it is not true now

can’t have been = I am sure it was not true in the past

Learn more about modal verbs here

7. Conditionals

Conditionals are another favourite in sentence transformation exercises.

First conditional

If you don’t hurry, you’ll miss the bus.

UNLESS

You’ll miss the bus unless you hurry.

Second conditional

I don’t have enough money, so I can’t buy a car.

WOULD

If I had enough money, I would buy a car.

Third conditional

She didn’t study, so she failed the exam.

HAVE

If she had studied, she would not have failed the exam.

Mixed conditional

He didn’t take the job, so he isn’t happy now.

WOULD

If he had taken the job, he would be happy now.

Conditionals are challenging because you need to understand both the grammar and the time reference.

You may also find my lesson on English conditionals useful, especially if you are preparing for B2 First:

Zero Conditional in English

First Conditional 

Second Conditional 

The Third Conditional 

Mixed Conditionals 

If and Wish in English

8. Wish and If Only

Wish and if only are very common in B2 First sentence transformations.

Present regret

I don’t know how to drive.

WISH

I wish I knew how to drive.

Past regret

I didn’t listen to your advice.

WISH

I wish I had listened to your advice.

Annoying habit

He always interrupts me.

WISH

I wish he would stop interrupting me.

The structure after wish is not always the same, so learners need to pay attention to the meaning.

Check out my lesson on wishes and regrets in English

9. Comparatives and Superlatives

Comparative structures often appear in sentence transformations.

Example:

This is the best book I have ever read.

BETTER

I have never read a better book.

Example:

Nobody in the class is taller than Max.

THE

Max is the tallest student in the class.

Example:

This exercise is easier than the last one.

AS

The last exercise was not as easy as this one.

Useful structures:

not as … as

the most … I have ever

never seen a better

far more interesting than

less expensive than

10. Verb Patterns: Gerund or Infinitive

B2 First often tests whether students know which verbs are followed by the infinitive and which are followed by the -ing form.

Example:

She said she was sorry that she arrived late.

APOLOGISED

She apologised for arriving late.

Example:

They decided not to go out because of the rain.

AVOIDED

They avoided going out because of the rain.

Example:

I would prefer to stay at home tonight.

RATHER

I would rather stay at home tonight.

Useful patterns:

avoid doing

enjoy doing

admit doing

deny doing

apologise for doing

decide to do

promise to do

would rather do

would prefer to do

Find the lesson on gerund and infinitive in English with practice worksheet here

11. Phrasal Verbs and Fixed Expressions

Sentence transformations also test vocabulary. In many questions, the answer depends on knowing a phrasal verb or fixed expression.

Example:

They cancelled the match because of the rain.

CALLED

The match was called off because of the rain.

Example:

I can’t tolerate his rude behaviour any longer.

PUT

I can’t put up with his rude behaviour any longer.

Example:

She resembles her mother.

TAKES

She takes after her mother.

Useful phrasal verbs for B2 First:

call off

put up with

run out of

look forward to

come across

get on with

take after

turn down

give up

carry on

Learn more about phrasal verbs here

12. Common Mistakes in B2 First Sentence Transformations

Students often lose marks because of small but important mistakes.

Mistake 1: Changing the key word

Wrong:

She has lived here from 2020.

Correct:

She has lived here since 2020.

Mistake 2: Changing the meaning

Original:

He is too young to drive.

Wrong transformation:

He is old enough to drive.

The grammar is correct, but the meaning is completely different. A beautiful sentence — going in the wrong direction!

Mistake 3: Forgetting dependent prepositions

Wrong:

She apologised arriving late.

Correct:

She apologised for arriving late.

Mistake 4: Using the wrong tense

Wrong:

I wish I know the answer.

Correct:

I wish I knew the answer.

Mistake 5: Forgetting the word limit

In B2 First, students must be careful with the number of words they write. Cambridge preparation materials state that answers in the key word transformation task must be two to five words, including the given key word.

How to Do Sentence Transformations Step by Step

Here is a simple method students can use in the exam.

Step 1: Read the first sentence carefully

Do not rush. Ask yourself:

What is the main meaning?

Is it about the present, past or future?

Is it positive or negative?

Is there a comparison, condition, regret or passive structure?

Step 2: Look at the key word

The key word usually gives you a clue.

For example:

despite → contrast

unless → conditional

wish → regret

too → result

used → past habit

such → so/such transformation

Step 3: Identify the grammar pattern

Ask yourself:

Is this testing passive voice?

Reported speech?

Conditionals?

Modal verbs?

Gerund or infinitive?

Phrasal verbs?

Step 4: Complete the sentence

Write your answer and read the whole sentence again.

Step 5: Check meaning, grammar and spelling

Before moving on, check:

Does the second sentence mean the same as the first?

Have I used the key word exactly?

Is the grammar correct?

Is the spelling correct?

Have I written the correct number of words?

B2 First Sentence Transformation Practice

Complete the second sentence so that it has a similar meaning to the first sentence. Use the word given. Do not change the word given.

1. Present Perfect

I last visited Rome three years ago.

BEEN

I __________________ Rome for three years.

2. Too / Enough

The suitcase was so heavy that I couldn’t carry it.

TOO

The suitcase __________________ carry.

3. Passive Voice

They are repairing the road at the moment.

BEING

The road __________________ at the moment.

4. Reported Speech

“I’m sorry I forgot your birthday,” said Emma.

APOLOGISED

Emma __________________ my birthday.

5. Conditionals

If you don’t study harder, you won’t pass the exam.

UNLESS

You won’t pass the exam __________________ harder.

6. Wish

I don’t have enough free time.

WISH

I __________________ more free time.

7. Comparatives

This is the most difficult exercise I have ever done.

SUCH

I have never done __________________ exercise.

8. Phrasal Verbs

They cancelled the meeting because the manager was ill.

CALLED

The meeting __________________ because the manager was ill.

9. Modal Verb of Deduction

I’m sure Tom forgot about the appointment.

MUST

Tom __________________ about the appointment.

10. Verb Pattern

She said she didn’t steal the money.

DENIED

She __________________ the money.

Answer Key: 1. haven’t been to, 2. was too heavy to, 3. is being repaired, 4. apologised for forgetting, 5. unless you study, 6. wish I had, 7. such a difficult, 8. was called off, 9. must have forgotten, 10. denied stealing

Download Sentence Transformations for B2 First Practice Worksheet in PDF here

Final Tips for Sentence Transformations for B2 First

Sentence transformations are not about memorising hundreds of random answers. They are about recognising patterns.

The more you practise, the more familiar these patterns become. You start to notice that too often leads to too + adjective + to, unless often replaces if not, and wish often points to regret.

To improve, keep a notebook of useful transformation patterns. Write down the original sentence, the key word and the correct answer. Over time, you will build your own grammar bank — and that is far more useful than simply doing exercises and forgetting them five minutes later.

Sentence transformations for B2 First may seem difficult at first, but with regular practice, they become much more manageable. Slowly, patiently, one structure at a time — that is the traditional way to master grammar, and it still works beautifully.