400
Someone, who looks like a clown, had been watching the class for hours.
Identify the nouns, pronouns, verbs, phrases, prepositional phrases, and articles. Identify where the subject and predicate should be divided.
Someone - pronoun
who looks like a clown - participle phrase
had been - HV
watching - AV
the - article
class - noun
for hours - prepositional phrase
S/P should be divided before "had".