即境活用改写句子
①When he was walking in the street,he came across one of his friends.
②Though I am tired,I believe running does us a lot of good.
③He never speaks to others unless spoken to.
2....but your friend can't go until he/she finishes cleaning his/her bicycle...
但是直到你的朋友清洗完他(她)的自行车他(她)才能去。
●用法拓展
until直到……为止,not until直到……才。肯定形式表示的意思是“做某事直至某时”,动词必须是延续性的。否定形式表达的意思是“直至某时才做某事”。动词为延续性或非延续性都可以。
①I slept until midnight.
我一直睡到半夜才醒了。
(在肯定句中可用before代替。Let's get in the wheat before the sun sets.)
②Don't get off the bus until it has stopped.
公共汽车停稳后再下车。
③I didn't manage to do it until you had explained how.
直到你教我后,我才会做。
●特别提示
(1)Not until...在句首,主句用倒装。
①Not until the early years of the 19th century did man know what heat is.
直到19世纪初,人类才知道热能是什么。
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