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关于连词as接时间状语从句中的延续性动词和瞬间性动词.

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关于连词as接时间状语从句中的延续性动词和瞬间性动词.
语法书中讲when、while、as引导时间状语从句的区别时,讲到when可接谓语是延续性和瞬间性动词的从句,而while和as只能接延续性动词的从句,但是,字典上有例句:I saw Tom as I was getting off the bus.这里get off是延续性动词吗,应该是瞬间性的吧?延续性动词跟在连词后是不是一般都用进行时态?比如:It began to rain while we were walking in the park.但是我在牛津字典上看到:I watched her as she combed her hair.为什么这里不用as she was combing her hair呢?
关于连词as接时间状语从句中的延续性动词和瞬间性动词.
下车get off既可以是延续性的也可以是不延续性的,要看作者想要表达何种意思了.下面这两句都是正确的:I saw Tom as I was getting off the bus.我下车时看到了汤姆I saw Tom when I got off the bus.我下车后看到了汤姆第一句强调在下车的过程中看到Tom(从下车的第一个动作开始一直到脚落地);第二句则忽略了下车的各种动作,got off强调刚下车的一瞬间(也就是脚落地的一瞬间).同理下面这两句都是正确的:I watched her as she combed her hair.I watched her as she was combing her hair.延续性动词跟在连词后用何种时态要看作者想要表达什么意思了,不一定用进行时.比如说下面这句:It began to rain when we walked into the park.