Clumps, waves are the two plural nouns.
It is I have come.
present simple I / you / we / they come
he / she / it comes
past simple came
past participle come
-ing form coming
It tells us that he is depressed and doesn't really know what he likes. He is immature, and seems to like to argue. He can't see the good in anything and Phoebe then calls him out on it. Hope this helps!:)
