long after， after long， long before， before long

[Mike12345]

Hi teachers

I am really confused to use these four phrases:long after， after long， long before， before long.

I think they are conjunctions. I know the meanings of the words: after, before. But I have no ideas what they mean when they have a word "long" with.

Could you please tell me what they mean and how to use them? Thank you!

 

[Rover_KE]

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