Search the forms of be, do and have that "help" a main verb build tense, questions, negatives and the passive
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English has two families of helping verb. The primary auxiliaries — be, do, and have — are on this page: they change form to match tense and person, and build questions, negatives, the passive voice, and the continuous/perfect aspects. The modal auxiliaries — can, could, may, might, must, shall, should, will, would — never change form and add meaning like ability, permission, or obligation instead.
She is working. · They have left. · Did you call?
She can swim. · They must leave. · Would you help?
Auxiliary verbs don't carry the main meaning of a sentence — they "help" the main verb by marking tense, forming questions and negatives, building the passive voice, or combining with -ing/-ed forms for the continuous and perfect aspects. The same three verbs — be, do, and have — also work as ordinary main verbs on their own ("I have a car"), which is exactly what makes them confusing to spot.
How to use it: type a form (like "was" or "did") or a function (like "question" or "passive") into the search box — the table filters instantly as you type.