Unit 1 Friendship
重点句型
1. ...but your friend can’t go until he/she finishes cleaning his/her bicycle.
……但是你的朋友不把自行车弄干净不能走。
not ... until 意为“直到……才”,表示主句谓语的动作直到until状语的时间才发生,主句的谓语动词表示的是动作的开始。until引导从句时,如果主句中的谓语动词是延续性动作,则主句用肯定式;如果主句中的谓语动词是短暂性动词,则用否定形式。
“It is/was not until+被强调的部分+that ...”相当于“Not until ... did (does, do, is ...)+主语 ...”意为“直到……才”,是强调形式。
You must stay in bed until your temperature is normal.
体温正常后,你才能起床。
He didn’t leave until the meeting was over.
直到会议结束他才离开。
It was not until she took off her dark glasses that I realized she was a film star.
=Not until she took off her dark glasses did I realize she was a film star.
=I didn’t realize she was a famous film star until she took off her dark glasses.
直到她摘下墨镜我才认出她是一位电影明星。
2. While walking the dog, you were careless and it got loose and was hit by a car.
遛狗的时候,你太大意了,一松手,狗就被车撞了。
while walking the dog是连词while加现在分词短语结构,强调分词的动作正在发生,相当于while you were walking the dog。
在时间、条件、让步、方式等状语从句中,如果从句的主语与主句的主语一致,谓语含有系动词be,可以省略从句的主语和系动词be。
When crossing the street, you should be careful.
过马路时,你应当小心。
If heated, water can be turned into vapour.
如果受热,水会变成蒸气。
温馨提示
在状语从句中,如果从句的主语为it时,也可以将it和助动词be省略。
Whenever possible they would stop him and ask the three questions.可能的话,他们就让他停下问他这三个问题。