before 句型
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9.before 句型：
(1) It will be +时间+ before + 还有多长时间……
例：It will be 4 years before he graduates. 他还有四年时间就毕业了。
(2) It was +一段时间+ before 过了多久就……
例：It wasn’t two years before he left the country. 还没到两年他们离开了那国家。
(3) before sb can/ could … 某人还没来
得及……
例：Before I could get in a word ，he had measured me．
(4) 过了多久才……
例：We had walked a long way before we found some water.
（5）还有“趁……（还没有）”之意。例如：They are thinking of buying the house before the prices go up.
(6) before long是“很快，不久”的意思, 可以用于各种时态。Before long, he went to America.
(7) long before是“很久以前”的意思
Eg: That happened long before. 那件事发生在很久以前。
They had known each other long before they got married.
10. since 句型：
It is/ has been +时间段+ since…+一般过去时. (到目前为止）干某事有多长时间了
It was + 时间段+ since +过去完成
时（到过去某时间为止）干某事有多长时间了
Sb/ sth.+ 现在完成时+since+ 过去时。。（注意从句的谓语动词是否延续）
Eg: It is about ten days since he came back from abroad.
It was days since I had left there.
比较一下：
He has written to me frequently since I fell ill. 自从我生病以来，他就经常给我写信。
He has written to me frequently since I was ill. 自从我病愈以来，他经常给我写信。
11. when 句型：
It will be +时间+ when +一般现在时当某事发生时，时间将会是。。。
It was +时间+ when+一般过去时当某事发生时，时间是。。
Eg: It will be midnight when they get there .
It was 1949 when new China was founded.