need做行为动词时后接 ______或________I need to wash hands first.(否定句)_______________________________________.(用作情态动词的否定句)________________________________________.

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need做行为动词时后接 ______或________
I need to wash hands first.(否定句)_______________________________________.
(用作情态动词的否定句)________________________________________.

I don't need to wash hands first.I needn't wash hands first