1. It's very noisy here. I can't stand it any more.
(What does "it" refer to in the first sentence? What does "it" refer to in the second sentence? Are both the same? Is 'it' an impersonal pronoun or just a pronoun which refers to something that is mentioned before?)
In the first sentence, "it" is an impersonal pronoun that doesn't have an antecedent. In the second sentence, "it" seems to refer to the noisiness.
In the first sentence, "it" refers to the overall noisy situation or environment. It suggests that the speaker is bothered by the noise.
In the second sentence, "it" also refers to the noisy situation. Here, the speaker is expressing their frustration and inability to tolerate the noise any longer.
In both sentences, "it" functions as an impersonal pronoun, representing something that was mentioned before or is understood from the context. It does not refer to a specific noun or object, but rather to the general concept of noise in this context.