only after怎么用

only after怎么用
only after就是用only来强调after引导的时间状语,意思是“只是在.之后.
这时候after可以是介词
如：
Some animals come out only after dark.
有一些动物只在天黑后才出来.
也可已是连词
如：
Ask the caller for their name and telephone number only after you have said whether your boss is available.
你只能在说你的老板是否能接电话后问来电话的人的姓名和电话号码.
如果将only after引导的时间状语放在句首,主句要倒装
如：
Only after being asked three times did he come to the meeting.
（did he come to the meeting是倒装）
只有在被请了三次以后,他才会往参加那个会议.