②by the time+一般现在时,主句常用现在完成时或将来完成时。
2by+时间状语,主句的谓语动词也应用相应的完成时形式。
(1)By the time he was twelve,he had learned mathematics all by himself.
到他12岁时,他已经自学了数学。
(2)By the time he comes back,I will have finished my work.
当他回来的时候,我将完成我的工作了。
多维训练
单句语法填空
(1)Mr.Mat had been persuaded(persuade) to give up smoking in the office by the time he started his new job.
(2)We will have learned(learn) Book 8 by the end of next month.
(3)By now,people have realized(realize) its importance.
8 However,it was Haydn who encouraged Beethoven to move to Vienna.,然而,是海顿鼓励贝多芬移居维也纳的。
1强调句型的基本结构为:It is/was+被强调部分+that/who+其他部分若被强调的是人,可用that或who;若被强调的部分是其他时,一律用that。另外要注意:本句型不能用于强调原句的谓语动词。
2强调句的一般疑问句结构为:Is/Was it+被强调部分+that/who...?
3强调句的特殊疑问句结构为:特殊疑问词+is/was it+that...?
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