必修四 UNITS 3~5 1....until...“直到……时候”;not...until...“直到……才……” The meeting was put off until ten o’clock.会议推迟到十点钟。 句型公式妙笔生花 Not until all the fish died in the river did the villagers realize how serious the pollution was.(倒装句) 等到湖里的鱼全死光了,村民们才意识到污染是多么严重。 2.unless...“除非,如果不……”(=if...not) I won’t attend his birthday party unless invited(=unless I am invited).除非被邀请,否则我不会去参加他的生日晚会。 3.主语+be doing...when...“正在做某事这时……” I was walking along the river when I heard a drowning boy cry for help. 我正在河边散步,这时我突然听到一个落水男孩求救。 4.主语+be about to do...when.../主语+be on the point of(doing)...when...“刚要……这时……” I was about to leave when it began to rain.我刚要离开,这时下雨了。 5.主语+had done...when...“刚做完……这时……” I had just finished my exam paper when the bell rang,announcing the class was over.我刚做完作业,下课铃响了。 本部分内容讲解结束 按ESC键退出全屏播放
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