(4)till/until与not…till/until的区别:前者表示一个延续性的动作,后者表示一个才开始的动作。如:I will stay here and watch the babyuntil you return.(我会呆在这里看着娃娃直到你回来)(stay这个动作一直进行到你return)/ They won’t go on workinguntil they get what they think is reasonable.(他们要到获得了他们认为合理的东西时才会继续干下去的)
另外till与until基本可以互换,但是在句首时只能用until,不能用till. 如:Untilthe last minute of the match we kept playing.(我们坚持到比赛的最后一分钟)/ Notuntilhe had finished his work did he go home.(直到做完工作他才回家)(倒装句)
(5)though与although的区别:两个词都表示“虽然,均不可以与but同时使用,但在句中可加still或yet连用。although“尽管、虽然仅作连词,比较正式,一般可以换为though;though“虽然、尽管、即使,①还可以与even连用(=even if),表示“即使、纵然,②作副词时意思是“然而、不过,不能放在句首。③although不能放在句末,though则可以,用“,隔开。如:He passed the examsalthoughillness prevented him from going to classes.(尽管疾病使他无法上课但是他还是通过了考试)/ she won’t leave the TV set,even thoughher husband is waiting for her for the supper.(她不愿离开电视机虽然丈夫在等她吃饭)/ It was a quiet party. I had a good time,though.(这是个不热闹的聚会尽管如此我还是玩得很开心)
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