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1.The teacher said to the students,"Don't waste your time

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1.The teacher said to the students,"Don't waste your time
改成The teacher______the student ____ _____waste _____time.怎么改 还有原因
2We knew who the murberer was after the police sovled the case.
We ____ ____who the murderer was ____the case.同上
我需要
1.The teacher said to the students,
The teacher told the students not to waste their time.
"tell sb (not) to do sth"告诉某人不要做/做某事.至于原因,意思基本相近就行了,没什么原因.
We didn't know who the murderer was until the case… 题中,“警方解决了这个案件之后,我们知道了谁是凶手.”改成“我们并不知道谁是凶手直到警方解决了这个案件”
补充:until前一定是否定,且until=till.
多背一些词组句式吧.对你有好处的.