This verb behaves like an ordinary verb in sentences such as these:
She dares/dared to contradict her teacher. Does/did she dare to tell him the truth? She doesn’t/didn’t dare to complain.
But it behaves like can and should in questions, in negative or ‘near-negative’ sentences, and in certain subordinate clauses:
Who would dare say a thing like that? How dare you be so rude? Nobody dare/dared question his authority. Jenny hardly dare/dared tell you. Huge daren’t/dared not complain. I don’t believe he dare face me again.
Don’t mix the two types. Say either if she dares to tell him or if she dell tell him – but not X. if she dares tell him.
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