Infographic: The 12 most misunderstood English words. So I was chatting with someone earlier this week and they used one of these words the "misunderstood" way, and I said, I think you mean this. and they thought I was wrong!
All modal verbs are auxiliary verbs, which means they can only be used with a main verb. Modal verbs cannot be a main verb. They are used to express ideas such as possibility, prediction, speculation, deduction and necessity.