24/05/16 How to Use the Word “HAPPEN”
Happen can be used with a following infinitive to suggest that something happens unexpectedly or by chance.
If you happen to see Joan, ask her to phone me.
One day I happened to get talking to a woman on a train, and she turned out to be a cousin of my mother’s.
In sentences with if, the idea of by chance can be emphasized by using should before happen.
Let me know if you should happen to need any help.