It is + 时间段 + since…
“自从...以来有一段时间了”。
It is + 时间点 + when…
“当……时候时间是……”。
It is + 时间段 + before…
“在……之前有一段时间”。
It was past one o’clock when he came in. It won’t be long before they understand each other. It was long before she came back. It will be long before we meet again. It will be five years before he meets you again. It is / has been four days since I caught a cold. It is / has been two weeks since we met last.
他哥哥入伍三年了。他哥哥退伍三年了.他病了两星期了。他病愈两星期了。他们结婚到现在已经十年了。他到这儿已经二十分钟了。。


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