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①After studying music in Vienna, Haydn went to work at the court of a prince in eastern Austria, where he became director of music.
②He learned to play the harpsichord when he was four.
③While he was still a teenager, Mozart was already a big star and toured Europe giving concerts.
④As he grew older, he began to go deaf.
⑤As soon as I see him, I'll tell him the news.
⑥By the time he was 14, Mozart had composed many pieces for the harpsichord, piano and violin, as well as for orchestras.
⑦Other composers had written symphonies before Haydn, but he changed the symphony into a long piece for a large orchestra.
⑧He said that he had been to Hong Kong many times.
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1.句②～⑥是由when, while, as, as soon as, by the time引导的时间状语从句。
2. after, before后跟句子时为连词，引导时间状语从句，不接句子时变为介词，后可接动名词doing作宾语。如句①。
3. by the time引导的时间状语从句中，若从句用一般过去时，主句常用过去完成时。如句⑥。
4．句⑦⑧中黑体部分为过去完成时，表示过去某一时间或动作之前已经完成或发生的某一动作。
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