as也可以引导让步状语从句.要用倒装.
Child ashe 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
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.
表示已经知道的原因时用as或since,即某种原因在说话人看来已经很明显,或已为听话人所熟悉,因此它是句中不很重要的部分.since要比as正式一些,它们通常被置于语句之前,但有时却相反.
Seeing all of the children already seated, he said,Since everyone is here, lets start.
下列情况下只能使用because:
①在回答why的问句时;
②在用于强调句型时;
③被not所否定时.
【职称英语等级考试各重点语法考点解析2】相关文章:
最新
2016-03-01
2016-03-01
2016-03-01
2016-03-01
2016-03-01
2016-03-01