“Take a moment to answer those questions on page 13 if you haven't done so already.”

You're a teacher. You're teaching your class with a textbook. Some of the students are moving quickly through the textbook, while some are moving more slowly. You want to tell the slower students to answer some questions. You say:

Take a moment to answer those questions on page 13 if you haven't done so already.

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“Yeah, I start to zone out after about five minutes.”

You're talking to a classmate about your professor's lectures. Your classmate says that his lectures are boring and hard to pay attention to. You agree, so you say:

Yeah, I start to zone out after about five minutes.

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