I don’t know if the kids could understand that.
and
I don’t know if the kids can understand that.
whats the difference here?
"could" is for something that happened in the past or something that you are imagining; "can" is for something that is happening in the present (either in the present instant or generally in the present).
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"could" is for something that happened in the past or something that you are imagining; "can" is for something that is happening in the present (either in the present instant or generally in the present).