以否定词开头的倒装句（2）
特殊句型一：
Not+"until...(状语或状语从句)"+一般疑问句
He didn't go home until 6 o'clock.（正常句型）
Not until 6 o'clock did he go home.（倒装句型）
他直到六点才回家去。
John didn't do his lessons until his mother came back.（正常句型）
Not until his mother came back did John do his lessons.（倒装句型）
John直到他母亲回来才做功课。
注：
1）until his mother came back不能拆开。
2）Not until did John do his lessons his mother came back.（错）
3）not until...在强调句中，仍用陈述句型
公式：It was+not until...that+陈述句词序
Not until 6 o'clock did he go home...
It was not until 6 o'clock that he went home.（强调句）
他直到六点才回家去。
特殊句型二：
Never+before+一般疑问句
He has never seen the film before.（正常句型）
Never before has he seen the film.（倒装句型）
他以前从未看过这部电影。
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