Question

12．他昨天把笔记中的难点尽可能多的挑选出来复习后才做作业．
Hedidn't do his homework until he picked out as many difficult points as possible in the notes and went over them yesterday．

Answer 1

分析 didn't do his homework until he picked out as many difficult points as possible in the notes and went over them．

解答 答案：didn't do his homework until he picked out as many difficult points as possible in the notes and went over them．这里是说过去的事情用一般过去时，表示直到…才，用not…until，做作业do his homework，do是实意动词，借助于did构成否定didn't，后加动词原形，故didn't do his homework until，until引导时间状语从句，主语he，挑选pick out，过去式picked out，尽可能多的难点as many difficult points as possible（as…as possible尽可能…）笔记中in the notes，and连词，连接两个对等成分，复习go over，后加宾语them，go的过去式是went，故答案是didn't do his homework until he picked out as many difficult points as possible in the notes and went over them．

点评 not…until指的是"直到…才"的意思，如 I did not go home until my mother called me．
我直到我妈妈打电话给我才回家．
当Not until位于句首时，句子要倒装．其结构为：Not until+从句/表时间的词+助动词+（主句）主语+谓语+．如：
①Not until the teacher came in did the students stop talking．直到老师进来学生们才停止讲话．
②Not until next week will the sports meet be held．直到下周才开运动会．