Question

Either Mark or his students _______ on the ferry boat. 10. If you want to use the present tense, which word would best fill the blank?

Answer 1

It depends on the verb, but you could say "rides," for instance. I think your teacher is trying to see if yo understand that the verb needs to be singular. When we use either/or, we follow it with a singular verb. So you wouldn't say "Either Mark or his students ride on the boat." You would say "Either Mark or his students rides on the boat."

Answer 2

the best word would be were because it is in the past tense :)