Page 525

525.1 week, weak

A week is a period of seven days; weak means “not strong.”

525.2 which, witch

Which is a pronoun used to refer to or point out something. A witch is a woman believed to have supernatural powers.

Which of the witches in The Wizard of Oz would you like to play?

525.3 who, which, that

Who is used to refer to people. Which refers to animals and nonliving things but never to people. That can refer to people, animals, or things.

The storm drains that dump untreated wastewater into our lake, which is already polluted, are a problem. Our mayor, who is an environmentalist, has a solution.

525.4 who, whom

Who is used as the subject in a sentence; whom is used as the object of a preposition or as a direct object.