Question

14．媽媽得知哥哥在日本地震中安全后才上床睡覺．
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．表達的是過去的事情用一般過去時，表示直到…才用not…until，go to bed上床睡覺，借助于助動詞did構成否定，故答案是didn't go to bed until

點評 not…until指的是"直到…才"的意思，如 I did not go home until my mother called me．
我直到我媽媽打電話給我才回家．
not until的倒裝與強調結構 
1．當Not until位于句首時，句子要倒裝．其結構為：Not until+從句/表時間的詞+助動詞+（主句）主語+謂語+．如：
①Not until the teacher came in did the students stop talking．直到老師進來學生們才停止講話．
②Not until next week will the sports meet be held．直到下周才開運動會．
2．not until的強調結構為：It is/was not until+從句/表時間的詞+that+．
上面兩句改為強調句為：
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．
直到我結婚的時候，我才有錢買了自己的房子．