need当情态动词时
You needn’t worry about me.
Need I pay now?
need当一般动词时
He needs to have a haircut.
She needed to change trains at Beijing Railway Station.
Did you need to show then your ID card?
I didn’t need to give a speech at the meeting.
“Do we need to pay for the tickets in cash?”
“No, you don’t need to.”
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