Question

19．李華幫媽媽做完家務(wù)才開始復(fù)習功課．
Li Huadidn't begin going over the lesson until she helped her mother finish doingthe housework．

Answer 1

分析 didn't begin going over the lesson until she helped her mother finish doing．

解答 答案：didn't begin going over the lesson until she helped her mother finish doing．這里是說過去的事情用一般過去時，這里表示直到…才用not…until…，主句是李華才開始復(fù)習功課，主語Li Hua，開始做某事用begin doing sth，復(fù)習功課go over the lesson，begin是實意動詞借助于did構(gòu)成否定，故Li Hua didn't begin going over the lesson，until引導時間狀語從句，主語用she代替，幫助某人做某事用help sb do sth，他媽媽her mother，完成做某事finish doing sth，做家務(wù)do housework，故until she helped her mother finish doing，故答案是didn't begin going over the lesson until she helped her mother finish doing．

點評 "not…until""意思是："直到…才…"表示在這個界限之前一直沒有發(fā)生這個動作You can't leave until I come back．．直到我回來你才可以離開"until""意思是："直到…"表示這個動作一直延續(xù)到這個界限出現(xiàn)時．   （易錯點：將"not…until""句型翻譯成了否定句，如上句：直到我回來你不可以離開×）