alc24 1 Alex sleeps while he sings. 2 Alex sings while he sleeps 3 Alex sleeps while he is singing. 4 Alex sings while he's sleeping.
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alc241 Alex sleeps while he sings.If Alex and "he" are the same person, all the sentences are very odd because no one can sleep and sing at the same time.
2 Alex sings while he sleeps
3 Alex sleeps while he is singing.
4 Alex sings while he's sleeping.
alc241 The cat miaowed while it walked/while it was walking.