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Hello, everyone !

Having read through several articles about the word in my dictionaries, I composed following sentences:

X prefers to sleep.
X prefers to be sleeping.

X prefers Y to sleep. (or... "X prefers for Y to sleep" is more common ?)
X prefers Y to be sleeping.

X prefers that Y sleeps.
X prefers that Y is sleeping.

Then I tried to find real, un-artificial examples online, but it was not so easy. So... would you please tell me whether they all are grammatically correct ? According to my dictionaries, they should be.... but I'm not sure, because they are merely my aritificial constructions.

please help me?
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Hello Roro

X prefers to sleep.
X prefers to be sleeping.*

— These are fine.

X prefers Y to sleep.
X prefers Y to be sleeping.*

— These are fine, if unusual.

X prefers that Y sleeps.
X prefers that Y is sleeping.*

— These too are fine; though you might also hear or read:

X prefers that Y sleep.
X prefers that Y be sleeping.*

(These are subjunctive forms.)

In those I've marked *, 'to be asleep' would probably be more usual than 'to be sleeping'.

MrP
Comments  
Hello, MrPedantic ! I needed such a confirmation as your's. You've given me exactly what I needed.

A million thanks for your help. I send you my best wishes! Roro