Question

you_(sleep) for three hours now correct the tense

Answer 1

You can sleep for three hours now.

Answer 2

You have been sleeping for three hours now.

• The word 'now' is the main clue.
• It indicates that something is happening in the present.
• However, other details like 'three hours' suggest that the activity has been happening for three hours.
• It means that we are talking about something that began in the past and is still continuing into the present.
• This is where we need to use the present perfect progressive tense.
• Thus, the correct answer is 'have been'.
• We used 'have' and not 'has' because 'have' is the auxiliary verb that goes with 'you'. Using 'has' will cause a subject-verb agreement error.

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