only在句首要倒装的情况

 　　Only in this way, can you learn English well.

　　Only after being¹ asked three times did he come to the meeting.

　　如果句子为主从复合句，则主句倒装，从句不倒装

　　Only when he is seriously ill, does he ever stay in bed.

1 being   

n.存在；生存；生命存在，生命，人， 本质；art.在，有，是

参考例句：

• Can you explain to me the purpose of being?你能对我解释一下存在的目的吗？
• What is the purpose of our being?我们生存的目的是什么？