When/While/As we were dancing,a stranger came in.(we
were dancing表示延续性的动作) 当我们跳舞时,一位陌生人走了进来。 The atmosphere gets thinner and thinner as the height increases. 随着高度的增加,大气越来越稀薄。 注意
(1)由when引导的时间状语从句,主句用过去进行时,从句应用一般过去时;如果从句和主句的动作同时发生,两句都用过去进行时的时候,多用while引导。 When the teacher came in,we were talking. 当老师进来时,我们在说话。 (当此句改变主从句的位置时,则为:While we were talking,the teacher came in.)
They were singing while we were dancing. 他们在唱歌,我们在跳舞。 (2)when和while还可作并列连词。when表示“在那时,此时突然”;while表示“然而,却”,表对比或转折关系。并列连词when常用于以下句型中: ①...was/were doing...when... (正在做……突然) ②...was/were about to do...when... (刚要做……突然) ③...was/were on the point of doing...when... (刚要做……突然) ④...had just done...when... (刚一…就) ⑤Hardly/Scarcely had...done...when... (刚一……就) The children were running to move the bag of rice when they
heard the sound of a motorbike. 孩子们正要跑过去搬开那袋米,这时他们听到了摩托车的声音。 He is strong while his brother is weak. 他长得很结实,而他弟弟却很瘦弱。 2.before引导时间状语从句
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