Can anyone give use cases and examples for
- Happen to know
- Came to know
- Got to know
- Came across
I always gets confused in their uses.
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Happen to know means something like You might not expect me to know, but I do. It often implies that I have privy knowledge: somebody's told me a secret, or I know about something before it is published. It is quite often a boast "Look at me, I'm special, I know this information which most people don't know", but not always.
Come to know (past: came to know) is a somewhat literary way of saying find out or learn (a fact), or become acquainted with (a person).
Get to know (past: got to know) means become acquainted or better acquainted with (a person). It is also a rather colloquial alternative to come to know (a fact).
Come across (past: came across) means find by chance or find out by chance.
I don't know if it helps but I have included a few sentences of correct usage of the expressions you mention.
'I happen to know the person you can see in that car.'; 'I came to know him when we were near-neighbours twenty years ago'. (This is less usual) 'I got to know him and his family quite well'. 'I recently came across his name when searching through some old paperwork'.