时间状语从句:常由when和while引导。例如:When I was young, I preferred to stay at home rather than going out. 条件状语从句:常由if和unless引导。例如:If you want to succeed, yo...
2. 当由一般疑问句充当宾语从句时,用if或whether引导,意为“是否”。 (1) Is it an interesting novel? I don’t know. I don’t know if /whether it is an interesting. (2) Does Cathy go to school early? Do you know? Do you know if /whether Cathy goes to sc...
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