(1)although与though可以引导让步状语从句,不能与but连用,但可以与yet连用.
Although they are poor,(yet)they are warm-hearted.
(2)even if或even though引导让步状语从句,表示即使,纵然,用来使人注意下文所强调内容的性质.
Ill get there even if(though)I have to sell my house to get enough money to go by air.
(3)no matter后接上who、what、where、how等疑问词,也可以在这类疑问词后面加上ever构成whoever、whatever、wherever、however等.
Dont trust him, no matter what / whatever he says.
Whoever breaks the law will be published.
No matter how hard the work is, youd better try to do it well.
(4)as也可以引导让步状语从句.要用倒装.
Child as(though)he is, he knows a lot.
Much as I like it, I wont buy.
Try as he would, he couldnt lift the heavy box.
3、原因状语从句:because, for, as, since, now that
(1)表示不知道的原因时用because,即说话人认为听话人不知道,因此because从句是全句最重要的部分,通常它被置于主句之后.
You want to know why Im leaving? Im leaving because Im full.
for虽然表示不知道的原因,但其语气较because要弱得多,是可说可不说的话,它只能置于主句之后,这时,for是并列连词.如果不是因果关系,而是对前面主句的内容加以解释或推断时,只能用for.如:Its morning now, for the birds are singing.(很显然,鸟叫不可能是现在已是早上的原因.)
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