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Are these sentences the same


-This is very interesting to me


-I am very interested in it

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No.

When you say 'this', you are telling us that the thing is in some sense close to you.

When you say 'that', you are telling us that the thing is in some sense not close to you.

When you say 'it', you are not telling us either. 'it' is more neutral in meaning.

Clive