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Do not come unless I call you. 我沒叫你，你就不用來。
4. though和as
兩個詞都可表示“雖然”、引導(dǎo)讓步狀語從句though引導(dǎo)的從句用正常語序；as引導(dǎo)的從句要用倒裝語序，即把從句中的表語、狀語或動詞原形放在as之前。
Cold as it was，he went on working.Though it was cold，he went on working. 盡管天氣冷，可他仍繼續(xù)工作
Child as he is，he knows a lot.Though he is a child，he knows a lot.
雖然他還是個孩子，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.
盡管你讀得快，你也不能在三天內(nèi)讀完這本書、：
Try as he might，he couldn‘t get rid of the difficulty.
Though he might try，he couldn‘t get rid of the difficulty.
不管怎樣努力，他還是擺脫不了困難。
5 .if和whether
(1)表示“是否”時，兩個詞都能引導(dǎo)賓語從句
I wonder if/whether you can examine him now. 不知你現(xiàn)在是否可以給他檢查一下。
［注意］①如果主句的謂語是短語動詞用whether,而不用if.
Everything depends on whether we have enough money. 一切都取決于我們是否有足夠的錢。
②某些動詞（如discuss）后的賓語從句，用whether而不用if來引導(dǎo)。
They discussed whether they should help her. 他們商議他們該不該幫助她。
③賓語從句移置句首時，用whether，而不用if
Whether it is true or not, I can‘t say．這是不是真的，我不敢說。
④賓語從句為否定形式時，通常用if, 而不用whether。
I asked her if he wouldn‘t come．我問她他是不是會來。
(2) if‘可譯作“如果”，引導(dǎo)條件狀語從句
If I were you, I would not go．如果我是你，我就不去。
