一、only引导的词组或句子放在句首作状语时,通常要用倒装结构.如：
Only in this way can you solve the problem.
只有通过这种方式你才能解决问题。
Only if you study hard can you pass the exam.
只有努力学习才能通过考试。
Only then did I realize my mistake.
只有那时我才意识到错了。
二、only放在不定式前面,常表示不愉快或出乎人们的意料的结果。如：
I went all the way to his home only to find hime out at a meeting.
我径直到他家里去,不料发现他出去开会了。
I hurried to the post office only to find it closed.
我匆忙赶到邮局,不料已经关门了。
She went home only to find her house burglarized.
她回到家里,发现房子被盗了。
