What does {it} mean? {It} here is empty object?

[Mister Micawber]

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I don't understand either of your sentences, tung quoc. What is this -- Only in the construction [the above NP] -- referring to?
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As I understand so far, the it in your #1 refers to something outside the context you have supplied, and your #2 is simply not meaningful.
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Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mr. Micawber

[Yankee]

Hi Quoc

The word "it" very often refers to a word that has been mentioned in a previous sentence. So, it is not "empty" or meaningless. It usually refers to something quite specific.

What are you trying to do? Are you looking for examples of sentences in which the word it doesn't have any real/definite meaning?
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Amy
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ESL teacher, translator, and a native speaker of American English