Posted by rfvv on Wednesday, March 19, 2014 at 2:24am.

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?)

English - Writeacher, Wednesday, March 19, 2014 at 7:59am
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.
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Thank you for your help.
What about the following?

2. The radio is very noisy here. I can't stand the radio any more.

(Are these sentences grammatical? Then, two 'it's in Sentence 1 can mean the same thing? Am I right?)

I'd delete "here" in the first sentence.

I'd replace "the radio" with "it."

Also ... "any more" should be anymore.

The sentences you provided are grammatical. In the first sentence, "The radio is very noisy here," the word "radio" is the subject. In the second sentence, "I can't stand the radio any more," the word "radio" is the object.

In this case, "it" in the first sentence and "the radio" in the second sentence refer to the same thing, which is the noise being produced by the radio. So, yes, you are right that both "it" in the first sentence and "the radio" in the second sentence can mean the same thing.