liuguanghui
幼苗
共回答了14个问题采纳率:57.1% 举报
1.可以把后面的be省略,这样避免重复.
2.让...被做,是have sth done,如:I have my hair cut.
need doing 也有被动的意思,相当于:need to be done,如:
My hair need cutting.=My hair need to be cut.
3.当然可以有两个时态,要看具体意思.最常见的就是“主将从现”:是指在时间状语从句、条件状语从句和让步状语从句中,如果主句是一般将来时,从句用一般现在时替代一般将来时.例:
When I grow up,I’ll be a nurse and look after patients.
或者有时候在从句中所说的现象是普遍现像,如:
The teacher said that the earth moves around the sun.
4.一般用do 或did,但似乎没见过用完成时的.
比如:We did go there last night.
1年前
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