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知识要点 2. By the time he was 14，Mozart had composed many pieces for the harpsichord，piano and violin，as well as for orchestras. 到他十四岁时，莫扎特已经谱写了许多拨弦键琴曲、钢琴曲、小提琴曲以及管弦乐曲。 by the time意为“到……时为止”，相当于连词，引导时间状语从句。 知识要点 归纳拓展 by the time+一般过去时，主句一般用过去完成时 by the time+一般现在时，主句一般用将来时或将来完成时 by the end of+过去时间，谓语部分用过去完成时 by the end of+将来时间，谓语部分用将来完成时 例句：By the time she was 15，she had written three long novels. 到她十五岁时，她已经创作了三部长篇小说。 By the time we graduate from this school，we’ll have learned English for 6 years. 到我们从这所学校毕业时，我们就已经学了六年英语了。 By the end of next term,I will have learned 5,000 English words. 到下学期期末，我将会学习5 000个英语单词。 知识要点 【链接训练】 ①This January will be very precious for us by which time we ________reviewing Senior Book I. A.will finish B.will have finished C.have finished D.will be finished 【解析】考查by the time在定语从句中的应用。by the time+一般现在时，主句一般用将来完成时。句意为：这个一月份对我们而言非常宝贵，到那时我们就已经完成必修一的复习了。 【答案】B 知识要点 ②By the time he was 14,Edison ________ his own small lab. A.built B.would build C.had built D.would have built 【解析】by the time引导的从句中使用的是一般过去时，主句应为过去完成时，故答案为C。 【答案】C 知识要点 要点四 | 
