He doesn't need a haircut.
He needn't wait for me.(third person single has no "s" add to,and no past mode.)needn't + infinitive do
He needn't have waited for me.(他本不必等我的。)
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He doesn't need a haircut.
He needn't wait for me.(third person single has no "s" add to,and no past mode.)needn't + infinitive do
He needn't have waited for me.(他本不必等我的。)