1.When someone is talking too loud, we say they are making noise, making a noise or making noises?
When someone is talking too loud(ly), we can say that he is being noisy or making too much noise. We don't say, in that context, that he is making a noise or making noises. If the person were not talking but hooting, whistling, squealing, etc., then we could say that he was making a noise or making noises.
2.Talk loud or talk loudly? What's the difference?
There is no difference. As an adverb, "loud" means "loudly." I know that I find it more natural, as a native speaker, to say "talk loud," though I sometimes use "talk loudly" anyway. It depends on my mood. When used as an adverb, "loud" is a flat adverb, like "safe" in "Drive safe" or "hard" in "Think hard."
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