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1.it's time to do sth.是时间做某事了
It's time to go home.
2.because…因为……
Because I still have a lot to do.
3.if you…I would…如果你……我会……
If you don't mind I would be grateful.
4.would you please…请问你能……
Would you please type these papers for me?
5.I've done sth.我已经做过某事了
I've finished the typing.