Answer:
Llegamos or Llegaremos
Step-by-step explanation:
Llegamos is the present tense of llegar and it also implies that there's more than one person involved, or you could also put " llegaremos" (which is in future tense) ,it would still make sense. (With llegaremos you're pretty much predicting the future as an making the decision that you WILL be late for every spanish class)
"Samuel y yo llegamos tarde a la clase de español todos los días" in english would be "Samuel and I arrive/are late for Spanish class every day"
"Samuel y yo llegaremos tarde a la clase de español todos los días" in english would be "Samuel and I will be late for Spanish class every day"