Step-by-step explanation:
Porter means To Carry or To Wear. It is regular ER Verb, so cut the ER at the last of verb and add -e, -es, -e, -e, -ons, -ez, -ent.
Finir means To Finish. It's a regular IR verb, so cut the IR, and add -s, -s, -t, -ssons, -ssez, -ssent, -ssent.