ถูกต้อง: have, do, will, shall, can, may, must, need, dare, ought to, used to, would, should, might, could, is, am, are, was, were, does, did, has, had, ไม่ถูกต้อง: swim, done, went, been, count, move, smile, play, sing, dance, read, vote, write, cut, put, speak, cross, eat, feed, love, outside, school, fall, imagine,

Auxiliary Verb / Helping Verb

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