No sooner had I come home than it began to rain.
16.now that 表原因，“既然，因为，由于”
Now that you are on duty,you should clean the classroom.
17.once 表时间，“一旦…” Once you promise , you should do it.
三、其他
1.since 表时间，“自从…以来” He has been in this company since he left school.
表原因，“既然，由于” Since the job is dangerous, let’s do it more carefully.
2.so far as/as far as 表条件，“就…而言，就…而论”
As far as I know, it is easy for you to speak in English.
3.so that 表目的“以便” Speak loud so that everybody can hear clearly.
表结果“如此,以致” He got up so late that he missed the bus.
4.than 表示比较，“比” Things were worse than we thought.
5.that 无词义，引导名词性从句 It is dangerous that we walk on the thin ice.
引导定语从句和状语从句 She hurried that she might not be late for work.
6.unless 表条件，“除非，如果不” I will go to the zoo unless it rains.
7.Until/till 表时间，“直到…为止” I’ll wait till he comes back.
8.when 表时间，“当…时“ When they got there, the train has left.
9.whether “是否”引导名词性从句 Whether he can some to see us is unknown.
表让步，“不管/无论、是否” Whether she is ill or well, she is always happy.
10.while 表时间，“当…时” While he was in Beijing, he visited the Great Wall.
表让步，“尽管，既然” While I find the problems very difficult, I don’t think them insoluble.
11.whenever 表时间，“无论什么时候” Whenever you meet any trouble, tell me at once.
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