only半倒装句的结构

"only + 状语"放在句首，句子半倒装

[例句]

Only when the war was over did he return to work. 直到战争结束他才回去工作。

Only after you have reached eighteen can you join the army. 你只有到了18岁才能参军。

Only in that way will we be ready for the challenges and opportunities in life.

只有这样，我们对生活中的机遇和挑战才会有充分的准备。

Only by changing the way we live will we be able to save the earth.

只有改变生活方式，我们才能拯救地球。

[注意]这种结构的倒装只在only引导状语的时候使用，only引导主语的时候不用倒装。

Only five men were hurt in the accident.（不倒装）