Verbs of Perception
Set 1 verbs indicate that the perceiver is "focusing" on a specific object. They can be used in the progressive.
Set 2 verbs indicate general perception and are non-progressive.
Set 3 verbs indicate appearance. (It "seems"…) They are non-progressive.
*When feel is used to describe emotions, the progressive is sometimes used.
*See can sometimes be used in expressions in the progressive.
Special Usage of Certain Verbs of Perception
Some verbs of perception see, look at, hear, listen to, and feel, along with watch and sense can be used with objects followed by other verbs (base form or gerunds, but not infinitives).
Note the examples below:
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