just bought 2004 honda civic how can I check if the timing belt was replaced on 2004 Honda Civic

there must be a way to inspect it.

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4 answers
if your going to take the time to check it you might as well replace it to be safe
Yes, the best answer is to replace it. Along with the timing belt and water pump, I would recommend that the tensioner and cam and crank seals be replaced as well. Also all the drive belts and the valve cover gasket since that has to be removed.
the top of the front cover must be removed to inspect the belt.

Roy
Can check on the back and see if the water pump was replaced , that's driven by the timing belt , and if it was replaced , odds are pretty good they did the t-belt.