Verified Answer :

WorldlyGlass49

The entire sentence is the main clause. The part that might confuse you is the comma separating "Rafael" but that only means that it's a vocative case.

scouteo

The correct answer is: Have you seen my text book?

The correct main clause of the sentence is Have you seen my text book?

This sentence is a complete one. It is understood as it is. The sentence is clear. It has a subject and predicated. There is no need for other words or expressions in order to understand it. A main clause can form a full sentence or a complete sentence by itself. If a coma appears in the sentence, it is still a main clause.

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