Would is a modal and auxiliary verb and the past form of "will". We can use it in several ways in English
“Had better” is normally used with infinitive without to to give advice about specific situations or make recommendations.We use the same form for the present, past or future without changing the “had” into “have”.
Both 'Shall' and 'Will' are modal verbs used to express future tense. If you've ever had any doubts whether to use shall or will in the Simple Future Tense, WILL is used for all persons in both singular and plural. We will begin to work in September. How long do you think this heat will … Continue reading Shall & Will
Can / Be able to (ability in the present/future) 'Can' is more usual and less formal than 'be able to' when talking about the present or future. Ann can type fast. I can pay you next week. (usual) I will be able to pay you next week. (less usual) Was able to (= managed to … Continue reading Modal Verbs of Ability