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Auxiliary Verbs

Forms of to do Forms of to have Forms of to be Modals
(used with base form of the next verb in the string) (used with past participle form of the next verb in the string) (used with present or past participle of the next verb in the string) (used with base form of the next verb in the string)
do, does, did have, has, had am, is, are, was, were can, will, shall, could, would, should
    be, being, been may, might, must

Note the words in the shaded area of the chart may sometimes act as single-word verbs.

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