The question is clear but I would like to add an example. (My sentence may have other errors as well)
I am glad that you think the same.
I am glad that you think the same, too.
Is this conversion correct?
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も replaces が in the sense that it does not become がも like you have でも or にも。
It's really hard to make examples. But here 子猫も the も replaces 子猫がいる