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改错:We need be quiet in the library.Not throw rubbish on the

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改错:
We need be quiet in the library.
Not throw rubbish on the floor ,please.
I should to take some medicine after meals.
What's the wrong with your brother
请具体说明原因谢谢.
改错:We need be quiet in the library.Not throw rubbish on the
1.将need改为should
因为need是需要,should是应该.这里应该用should
2.将not改为don't
因为这是祈使句,否定形式用don't
3.把to去掉.
因为should是情态动词,后面接动词原型
4.把the去掉
因为what's wrong 是固定的