What part of speech is Mr. Morton?

What part of speech is the word they?

What are the pronouns in this sentence: The ninjas threw darts at him but they missed.

What part of speech is swords?

What are the common nouns in this sentence: Mr. Morton waited for the bell to ring.

What are the proper nouns in this sentence: Mr. Morton thought about how Chicago is a city in the state of Illinois.

What part of speech is the word security guard?

What is the preposition in this sentence? Then he chewed the end of a yardstick into a point.

What is the preposition in this sentence: He hid under his desk?

What is the preposition in this sentence. The ninjas put their swords behind their backs.