只有...才.... 用英语怎么说

Only when you learn how important it is can you put your heart into it.

只有当你了解它 的重要性， 你才会全身心投入去学习它。

只有在夏季才可以通行的山路.

The mountain route that is practicable only in summer

只有受到挑衅时才以暴力还击

React with violence only under provocation,ie when provoked

只有人类才有理性.

Only man has reason

only...can...

Only you that I can trust.你是我唯一信赖的人.

Only Helen that can help you to solve the problem.

只有海伦才能帮你解决问题.

only...can...

注意:当only在句首时,动词要放到主语前面.