The closer / we get to closing the merger deal,/
the more uncertain / we are of making the purchase.
I want to know The underlined sentence's meaning. What means that?
Please, Provide me with explanation.
Thanks for your attention.
To answer your question, "we are of making the purchase," is a dependent clause. (A dependent clause has both a subject and a verb but can't stand alone as a sentence.) This clause functions as an adverb and modifies closer. Often, dependent clauses have an understood that at the beginning. It's not written, but we understand that it's implied. This may help:
...the more uncertain /that/ we are of making the purchase...
The meaning of this clause is that the speaker isn't certain whether or not the purchase will actually occur. (I imagine that the purchase would be of the other company since we're talking about a merger.)