原因状语从句:常由because, as, since和for引导。例如:Nonetheless, I am still in favor of space travel, for it has brought us many benefits. 时间状语从句:常由when和while引导。...
例It was not until she took off her dark glasses that I realized she was my brother. 4. 注意强调句型与定语从句的区别 例It was at 7 o'clock that he came here yesterday.( 强调句型) It was 7 o'clock when he came here yesterday.(定语从句) 六、It 常用的...
until既可以用作介词,又可用作连词。作介词时,后面要接具体的时刻;作连词用时,后面要接时间状语从句。以下就是关于until的使用方法的一个整理 until的意思 prep. 到 为止;在 以前; conj. 到 为止,在 以前;直
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