'Seeing' does not work there, while 'looking at' does. Verbs of sensation do not usually take continuous form, though they can in other circumstances. ' is not.
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moon7296Then.. my question #3, He is seeing the sights of Paris. (0), is OK based on your post:Don't get the IF statement in the wrong order!
Special cases: Imaginary or hallucinatory sensations. -ing. see, hear.
He is seeing things.
He is hearing voices.