when和before句型

when句型 句型
before句型 句型
1. It will be +时间 时间+before …还有多长时间 还有多长时间… 时间 Eg. It will be 4 years before he graduates. 2. before sb… can/could…某人还没来得及 某人还没来得及… Eg. The phone rang in the middle of the night, and the hung it up before I could answer it. 3. had done some time before…才… 才 Eg. They had sailed three days and three nights before they saw land. .
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before句型 句型
4. had not done…before不到 就… 不到…就 不到 Eg. We hadn’t walked a mile before he felt tired. 5. It was not +一段时间 一段时间+before… 一段时间 不多久就… 不多久就 Eg. It wasn’t 2 years before he left the country.
正在做某事时突然… 1. be doing sth.…when …正在做某事时突然 正在做某事时突然 Eg. He was still smiling when the door opened and his wife came in. 正要做某事时突然… 正要做某事时突然 2. be about to do sth. …when … Eg. We were about to start when it began to rain. 3. had not/hardly/just done sth. when … Eg. He hadn’t/hardly fallen asleep when the telephone rang. 4. had just done …when … Eg. He had gone to bed when the telephone rang.