Am is the main verb in the sentence. There is no auxiliary verb. Able is an adjective.
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Am is the main verb in the sentence. There is no auxiliary verb. Able is an adjective. It is like this sentence:
I am happy to go.
"To go" explains the reason I am happy.
Persian LearnerIs it an auxiliary verb complementing go?No. Anyway, auxiliary verbs can't be the complements of the verbs that come next in a sentence. If anything, it's the other way around, and 'to go' is the complement of 'able'.