--sentence
$subject $verb $object.
$subject, while $gerund $object, $verb $object.
$subject watches $object $gerund $object.

--subject
$person
The $adjective $person

--object
$person

--person
Butthead
Mrs Krabappel
Charlie Brown
Mrs Robinson

--adjective
observant
naive
embarassed

--verb
kisses
kicks
envies

--gerund
holding
zapping
hugging
smashing