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We put the verb 'to be' before the subject:
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| To be |
Subject |
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Are
Is |
they
he |
busy?
ready? |
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We put an auxiliary verb (be, have, can, will, may, ...) before the subject:
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| Auxiliary |
Subject |
Verb |
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Is
Will |
Mark
they |
leaving?
win? |
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With present simple verbs, we put do/does before the subject.
With past simple verbs, we put did before the subject.
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| Do, does, did |
Subject |
Verb |
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Do
Does |
they
she |
live
play |
in New York?
tennis? |
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