Should Of

The following are errors in English: * I should of known better. * They could of beaten us. * He must of left by now. * an asterisk in front of a sentence denotes an ungrammatical sentence. In good, grammatical English we say instead: I should have known better. They...

Modal Verbs in English

Modal verbs are used to express ideas such as ability, necessity, permission, and possibility. There are not many modal verbs: can, could, dare*, need*, may, might, must, shall, should, will, would. There are also modal constructions: be able to, ought to, be allowed...