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I sow (have seen) in a reading of the site and in many other situations these kind of grammar structure:

A)They are close "to making" an arrest.

Do you think it is possible to use "to make" in the place of "to making" or there is a subtle difference between the two cases?

For instance whilst talking I used a sentence like:

B)It allows the "built up" of ....

Is it correct or I should say "the building up"?