while 作并列连词，表示两种情况对比。 He was playing the guitar while his sister was watching TV.

　　1 Don't be afraid of asking for help____it is needed.

　　A unless B since C although Dwhen

　　2 Why do you want a new job___you've got such a good one already? A that

　　B where

　　Cwhich

　　D when 3____I accept that he is not perfect,I do actually

　　like the person. A while Bsince C before DUnless 4He likes pop music，——I am fond of folk music. A while Bsince C before DUnless D D A A 2 as soon as, immmediately

　　directly instantly, the moment ,the minute,the sceond,every time, each time, next time

　　no sooner ...than

　　hardly...when scarcely...when No sooner had we arrived at the station than the train left. The moment I heard the voice,I knew

　　father was coming Next time you come here,do remember

　　bring your son here. 直到他妈妈回来他才上床睡觉 1)He will not go to bed until(till) his

　　mother comes.

　　2)Not until his mother came back did he

　　go to bed.

　　3)It was not until his mother came back

　　that

　　he went to bed.(强调结构） 3 till, until

　　问题2： 1) — Was his father very strict with him when he was at school?

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