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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 could have beaten us.
He must have left by now.
All these examples use the correct past forms of…

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 to.

Modals always come first in a verb‎ formation, before other auxiliaries and the main verb:
{modal} + [auxiliary] + {main verb}
N.B…