In this English grammar lesson you will learn how we use modal verbs in EnglishWe use modal verbs when we talk about:abilityI can't answer the phone at the moment. My hands are dirty.I could swim when I was three years old.certaintyYou must have seen him. He was standing right next to you.obligation and necessityYou should/ought to call your … [Read more...] about How to use modal verbs in English