Understanding whether a verb is the main verb or not can help tell me if a group of words is a clause or phrase . The main clause (the core of the sentence) is (Something) can help tell me (something). (something - subject ) can help (main verb, modal form) tell (infinitive form of the verb tell following the catenative verb "help") me (indirect object) (something - direct object of "tell") The first something, the subject , is Understanding whether a verb is the main verb or not this is a gerund phrase BUT the direct object of the gerund "understanding" is a clause: whether a verb is the main verb or not The second something, the direct object , is:the subordinate clause: if a group of words is a clause or phrase .
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