In the given sentence Racing was becoming her primary interest. the word becoming is the main verb and was becoming is the auxiliary verb.
Because The primary verb, also known as the lexical verb, is the main verb. The crucial verb in a sentence—the one that often expresses the action or status of the subject—is referred to by this word. A assisting verb, also known as an auxiliary verb, may be used alongside main verbs or they may stand alone.
To identify the primary verb in a statement, keep in mind: Typically, a primary verb follows the subject. In order to communicate tense, aspect, modality, voice, stress, etc., an auxiliary verb adds functional or grammatical meaning to the phrase in which it appears. An infinitive verb or a participle, which offer the clause's major semantic substance, is typically accompanied by auxiliary verbs.
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