Do not come unless I call you. 我没叫你,你就不用来。
4. though和as
两个词都可表示“虽然”、引导让步状语从句though引导的从句用正常语序;as引导的从句要用倒装语序,即把从句中的表语、状语或动词原形放在as之前。
Cold as it was,he went on working.Though it was cold,he went on working. 尽管天气冷,可他仍继续工作
Child as he is,he knows a lot.Though he is a child,he knows a lot.
虽然他还是个孩子,可是他很懂事
Fast as you read,you can‘t finish the book in three days.
Though you read fast,you can‘t finish the book in three days.
尽管你读得快,你也不能在三天内读完这本书、:
Try as he might,he couldn‘t get rid of the difficulty.
Though he might try,he couldn‘t get rid of the difficulty.
不管怎样努力,他还是摆脱不了困难。
5 .if和whether
(1)表示“是否”时,两个词都能引导宾语从句
I wonder if/whether you can examine him now. 不知你现在是否可以给他检查一下。
[注意]①如果主句的谓语是短语动词用whether,而不用if.
Everything depends on whether we have enough money. 一切都取决于我们是否有足够的钱。
②某些动词(如discuss)后的宾语从句,用whether而不用if来引导。
They discussed whether they should help her. 他们商议他们该不该帮助她。
③宾语从句移置句首时,用whether,而不用if
Whether it is true or not, I can‘t say.这是不是真的,我不敢说。
④宾语从句为否定形式时,通常用if, 而不用whether。
I asked her if he wouldn‘t come.我问她他是不是会来。
(2) if‘可译作“如果”,引导条件状语从句
If I were you, I would not go.如果我是你,我就不去。