Pls help

Thank you in advance

Iwant to make sure im right on this one, the 'manger' should be 'mange' in this sentence right? "je manger la pizza."

Select the verb phrase that best completes this conversation. romain: que-est ce que tu vas faire en tant que bénévole? bertrand: je les victimes des catastrophes naturelles. a.vais commencer b.vais offrir c.vais aider d.vais aller

What are the different forms of "avoir" and how do you use them?