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Auxiliary verb agreement |
 | | As was explained in the English lesson about general subject verb agreement, every correct sentence in English must have a subject and verb that match for person and number. |
 | | Included in the list of auxiliary verbs are modal auxiliary verbs, which specifically help to provide additional information about the mood of the main verb that follows it, or help add to the level of necessity. |
 | | The complete list of auxiliary verbs is: be, being, been, do, does, did, may, must, might, have, has, had, could, would, should, shall, will, am, are, is, was, were, can, ought, and shall. |
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