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方式。 ,成為可以延續(xù)的狀態(tài),因而可與表示一段時間的狀語連用。如: He hasn39。t left here since 1986. I haven39。t heard from my father for two weeks. until/till 連用,構(gòu)成 not+終止性動詞 +until/till ...的句型,意為 直到……才…… 。如: You can39。t leave here until I ,你才能離開這里。 I will not go to bed until I finish drawing the picture ,我才上床睡覺。 when 引導的時間狀語從句中,但不 可以用于 while 引導的時間狀語從句中。 when 表示的時間是 點時間 (從句謂語動詞用終止性動詞 ),也可以是 段時間 (從句謂語動詞用延續(xù)性動詞 )。而 while表示的是一個較長的時間或過程,從句謂語動詞用延續(xù)性動詞。如: When we reached London, it was twelve o39。clock. (reach 為終止性動詞 ) Please look after my daughter while/when we are away. (be away 為延續(xù)性動詞短語 ) how long 連用 (只限于肯定式 )。如: 誤: How long have you e here? 正: How long have you been here? 正: When did you e here? 鞏固練習: 1. When Henry arrived at the bus stop, the bus ______ for two hours. A. has left B. had left C. has been away D. had been away 2. I ______ the League for five years so far. A. joined B. have