I had to work.
She had to work.
Did you have to work? Did she have to work?...
I must work. / I have to work. / I've got to work.
She must work. / She has to work. / She's got to work…
Do you have to work? / Have you got to work? Does she have to work? / Has she got to work?...
I'll have to work.
She'll have to work.
Will you have to work? Will she have to work?...
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