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What's more accepted in the spoken English:

1) "I know that"
2) "I know this"
3) "I know it"?

Context:

1) Q. "Do you know Oxford university?" A. "Yes, I know it / this / that"

2) Q. "There are so many people here"? A. "Yes, I know it / this / that"

I'd like to get examples for using "I know this" or "I know that"

closed as too broad by user3169, Adam, ColleenV, Kinzle B, pyobum May 6 '15 at 3:18

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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None of those are an idiom, the phrases do not mean anything more than what the words literally say.

If you don't know which pronoun to choose, Google provides some good definitions to help:

To know that

  • used to identify a specific person or thing observed by the speaker.

  • referring to the more distant of two things near to the speaker (the other, if specified, being identified by “this”).

  • referring to a specific thing previously mentioned (NOT just mentioned), known, or understood.

  • used in singling out someone or something and ascribing a distinctive feature to them.

  • used to introduce a defining or restrictive clause, especially one essential to identification (Use that if a clause follows, i.e. To know that he was still out there was shocking.)

To know this

  • used to identify a specific person or thing close at hand or being indicated or experienced.

  • referring to the nearer of two things close to the speaker (the other, if specified, being identified by “that”).

  • referring to a specific thing or situation just mentioned.

To know it

It is a general neuter, non-personal pronoun in English that doesn't relate to things previously mentioned in earlier context or conversation like this or that. If no earlier context or conversation exists, it would be used.

So the right pronoun depends on what you are knowing and how it relates to previous conversation or context.

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