時間狀語從句的時態用法簡述
時間狀語從句，顧名思義，時間是最重要的，而時間則通過時態的使用來表達，時態一錯，整個句子的意思也錯了，不同的連詞也需要搭配不同的時態來使用，往往令很多學習者焦頭爛額，這次滬江小編爲大家整理了時態使用的注意點，大家快來一起學習一下吧！
一.主從句時態呼應，即主句用現在時，從句也用現在時；主句用過去時，從句也用過去的某種時態，除此之外，主句用將來時，從句依然要用現在時。
eg. Be careful when you cross the road。
When he was seven years old, he could swim.
When she leaves, she will turn off the light.
二. 不同的時間狀語需要搭配不同時態的使用：
1.Often,usually----------動詞原型do,does,am,is, are
2.yesterday,last Sunday,in the past-------動詞過去式did,was,were
3.now--------be+doing
4.while,at that time,-------was doing,were doing
5.since從句,for 2 days,------have done,have been
since+過去的某個時間點----had done,had been
一般現在時：every…, sometimes, at …, on Sunday,
一般過去時：yesterday, last week, an hour ago, the other day, in 1982, just now
一般將來時：next…, tomorrow, in+時間,
現在完成時：for, since, so far, ever, never, just, yet, till/until, up to now, in past years, always, recently
過去完成時：before, by, until, when, after, once, as soon as
過去進行時：this morning, the whole morning, all day, yesterday, from nine to ten last evening… when, while
將來進行時：soon, tomorrow, this evening, on Sunday, by this time, tomorrow, in two days, tomorrow evening
