It happened to me recently that I was telling someone how much I had enjoyed reading Barack Obama’s ...

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explained me explained to me that explained that explained to me

that had taken place taken place that had happened to happened

happened to; that occurred to; it happened to; which occurred to; which

are built 　 build 　 have built　　　 have been built

from their effects of which effects　 of its effects from whose effects 

have been taken place have taken place h

the others them it which

that it me there

from their effects of which effects of its effects from whose effects

I happened it happens It so happened I happen

was happened happened appeared came on

happened unexpectedly changed quickly prevented unexpectedly caught up with

Let me tell you Let me to tell you Allow me tell you Allow me to tell you

Tell me What was that　 I can’t believe it How it happened 

that had happened that had happened to him what had been happened what had happened to him

when did it happen when it happened when was it happened when it was happened

to tell tell told had told

needn’t have happened could have happened would never have happened must have happened

needn’t have happened could have happened would never have happened must have happened