Question

14．妈妈得知哥哥在日本地震中安全后才上床睡觉．
Mumdidn't go to bed until she knew my brother was safe in the earthquake in Japan．

Answer 1

分析 didn't go to bed until

解答 答案：didn't go to bed until．表达的是过去的事情用一般过去时，表示直到…才用not…until，go to bed上床睡觉，借助于助动词did构成否定，故答案是didn't go to bed until

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．
not until的倒装与强调结构 
1．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．
2．not until的强调结构为：It is/was not until+从句/表时间的词+that+．
上面两句改为强调句为：
③It was not until the teacher came in that the students stopped talking．
④It is not until next week that the sports meet will be held．
直到我结婚的时候，我才有钱买了自己的房子．