(1) before sb can/ could … 某人還沒來得及……
例：Before I could get in a word ，he had measured me.
我還沒來得及插話，他就給我量好了尺寸
(2) It will be +時(shí)間+ before + 還有多長時(shí)間……
例：It will be 4 years before he graduates. 他還有四年時(shí)間變畢業(yè)了。
(3) had done some time before (才……)
例：We had sailed four days and four nights before we saw land.
我們航行了四天四夜才見到陸地。
(4) had not done --- before --- 不到……就……
例：We hadn’t run a mile before he felt tired.
我們還沒走到一英里路就覺得累了。
(5) It was not +一段時(shí)間+ before 不多久就……
例：It wasn’t two years before he left the country.
還沒到兩年他們離開了那國家。
例：Before I could get in a word ，he had measured me.
我還沒來得及插話，他就給我量好了尺寸
(2) It will be +時(shí)間+ before + 還有多長時(shí)間……
例：It will be 4 years before he graduates. 他還有四年時(shí)間變畢業(yè)了。
(3) had done some time before (才……)
例：We had sailed four days and four nights before we saw land.
我們航行了四天四夜才見到陸地。
(4) had not done --- before --- 不到……就……
例：We hadn’t run a mile before he felt tired.
我們還沒走到一英里路就覺得累了。
(5) It was not +一段時(shí)間+ before 不多久就……
例：It wasn’t two years before he left the country.
還沒到兩年他們離開了那國家。