May、Need、Must提问的一般疑问句的肯定回答和否定回答分别是什么?

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May、Need、Must提问的一般疑问句的肯定回答和否定回答分别是什么?

May I come in?Yes,you can./No,you can't.
Need she hand in her homework now?Yes,she must./No,she needn't.
Must Lily do the task before 10a.m.Yes,she must./No,she needn't.