Module 3 MusicSection Ⅲ Grammar 时间状语从句和过去完成时　　　　　　　　　　　　　　

　　语法图解

　　探究发现

　　①Whenhe was very young, Mozart had a lot of musical talent.

　　②While he was still a teenager, he was a big star.

　　③As he grew older, he began to go deaf.

　　④By the time he was 14, Mozarthad composed many pieces for the harpsichord, piano and violin, as well as for orchestras.

　　⑤Afterthey had known each other for many years, Beethoven said, "He is a good composer, but he has taught me nothing."

　　⑥Before they visited India, they had recorded seven albums.

　　[我的发现]

　　(1)以上所有例句中都包含一个时间状语从句。

　　(2)例句④⑤⑥都包含了一般过去时或过去完成时。

　　(3)例句①②中，when和while都表示"当......时候"，例句③中as表示"随着"。

　　(4)例句④⑥中，by the time和before引导时间状语从句，从句用一般过去时，主句则用过去完成时。

　　(5)例句⑤中，after引导时间状语从句，主句用一般过去时，从句用过去完成时。

　　一、时间状语从句

时间状语从句用来说明主句谓语动词发生的时间，由连词引导。本单元主要学习when, while, as及by the time引导的时间状语从句。