could scrutinize
Regular verb: scrutinize - scrutinized- scrutinized

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could scrutinize
you could scrutinize
he could scrutinize
we could scrutinize
you could scrutinize
they could scrutinize 	I could be scrutinizing
you could be scrutinizing
he could be scrutinizing
we could be scrutinizing
you could be scrutinizing
they could be scrutinizing	I could have scrutinized
you could have scrutinized
he could have scrutinized
we could have scrutinized
you could have scrutinized
they could have scrutinized	I could have been scrutinizing
you could have been scrutinizing
he could have been scrutinizing
we could have been scrutinizing
you could have been scrutinizing
they could have been scrutinizing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't scrutinize
you couldn't scrutinize
he couldn't scrutinize
we couldn't scrutinize
you couldn't scrutinize
they couldn't scrutinize 	I couldn't be scrutinizing
you couldn't be scrutinizing
he couldn't be scrutinizing
we couldn't be scrutinizing
you couldn't be scrutinizing
they couldn't be scrutinizing	I couldn't have scrutinized
you couldn't have scrutinized
he couldn't have scrutinized
we couldn't have scrutinized
you couldn't have scrutinized
they couldn't have scrutinized	I couldn't have been scrutinizing
you couldn't have been scrutinizing
he couldn't have been scrutinizing
we couldn't have been scrutinizing
you couldn't have been scrutinizing
they couldn't have been scrutinizing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I scrutinize?
could you scrutinize?
could he scrutinize?
could we scrutinize?
could you scrutinize?
could they scrutinize? 	could I be scrutinizing?
could you be scrutinizing?
could he be scrutinizing?
could we be scrutinizing?
could you be scrutinizing?
could they be scrutinizing? 	could I have scrutinized?
could you have scrutinized?
could he have scrutinized?
could we have scrutinized?
could you have scrutinized?
could they have scrutinized? 	could I have been scrutinizing?
could you have been scrutinizing?
could he have been scrutinizing?
could we have been scrutinizing?
could you have been scrutinizing?
could they have been scrutinizing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I scrutinize?
couldn't you scrutinize?
couldn't he scrutinize?
couldn't we scrutinize?
couldn't you scrutinize?
couldn't they scrutinize? 	couldn't I be scrutinizing?
couldn't you be scrutinizing?
couldn't he be scrutinizing?
couldn't we be scrutinizing?
couldn't you be scrutinizing?
couldn't they be scrutinizing? 	couldn't I have scrutinized?
couldn't you have scrutinized?
couldn't he have scrutinized?
couldn't we have scrutinized?
couldn't you have scrutinized?
couldn't they have scrutinized? 	couldn't I have been scrutinizing?
couldn't you have been scrutinizing?
couldn't he have been scrutinizing?
couldn't we have been scrutinizing?
couldn't you have been scrutinizing?
couldn't they have been scrutinizing?