Would you tell me what does "had to do with something" mean?
I know what does "have to do with" mean but I can not get the meaning of ""had to do with"".
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I believe it's the past tense of "has to do with". Meaning, it's logically connected to, or caused by, the other thing. For example,
"Why do the sea levels rise and drop each day periodically? It has to do with the Moon's gravitation."
This asks about how something is involved with something else
"What do you have to do with this?"
In this case, the question is asking how someone is involved with something.
"I don't have anything to do with this"
The person who is replying says that they are inot involved with the specified thing.
"I don't know what he had to do with it"
The speaker doesn't know why the person was involved with "it", but they know that they were involved.