In the sentence "I will help Jenny with her paper," what is the main verb?

The main verb in the sentence "I will help Jenny with her paper" is indeed "help." The verb is the action word in a sentence, and in this case, it indicates the action that the subject (I) is performing in relation to the object (Jenny's paper).

While "will" is a helping verb that indicates the future tense, it is not the main verb itself; it merely assists "help" in forming the future tense. "Jenny" is a noun and part of the sentence structure that indicates who is receiving assistance, while "I" is the subject of the sentence that performs the action. Therefore, "help" is the focal action that drives the meaning of the sentence.