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Example.

1) She can swim.
ปฏิเสธ She can not swim.
คําถาม Can she swim ?
คําถามปฏิเสธ Can she not swim ? (= Can’t she swim?)

3) They have been sleeping there for two hours.
ปฏิเสธ They have not been sleeping there for two hours.
คําถาม Have they been sleeping there for two hours?

คําถามปฏิเสธ Have they not been sleeping there for two hours?
(= Haven’t they been sleeping there for two hours?)