② 表示与过去事实相反的愿望时使用if only sb. had done/been sth.; if only sb. could have done sth.的结构。
only if “只要…”:only if本身不是一个固定词组。only是副词,用来修饰整个 if从句。用于句首,后接从句,主句用部分倒装。
Only if a teacher has given permission is a student allowed to leave this room.
2.【参考答案】①B ②B ③A ④B ⑤C
【点拨拓展】1) as
conj. ①当…时;随着
As she grew older, she gained in confidence.
随着年龄的增长,她的信心也增强了.
② 照…方式
Leave the papers as they are. 别动那些文件.
③因为,由于
As you were out, I left a message.你不在,我就给你留了口信.
④正如,如同
She’s very tall, as is her mother.她个子很高,和她妈妈一样.
⑤尽管
例如:
尽管他们很快乐,可总缺少点什么. Happy as they were, there was something missing.
as引导让步状语从句一般放在主句之前,须用倒装语序。从句中的表语、状语或动词原形置于句首。若表语是名词,前置时要省略冠词。
Child as he is, he knows a lot.
Much as I like it, I won’t buy it, for it’s too expensive.
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