could notice
Regular verb: notice - noticed- noticed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could notice
you could notice
he could notice
we could notice
you could notice
they could notice 	I could be noticing
you could be noticing
he could be noticing
we could be noticing
you could be noticing
they could be noticing	I could have noticed
you could have noticed
he could have noticed
we could have noticed
you could have noticed
they could have noticed	I could have been noticing
you could have been noticing
he could have been noticing
we could have been noticing
you could have been noticing
they could have been noticing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't notice
you couldn't notice
he couldn't notice
we couldn't notice
you couldn't notice
they couldn't notice 	I couldn't be noticing
you couldn't be noticing
he couldn't be noticing
we couldn't be noticing
you couldn't be noticing
they couldn't be noticing	I couldn't have noticed
you couldn't have noticed
he couldn't have noticed
we couldn't have noticed
you couldn't have noticed
they couldn't have noticed	I couldn't have been noticing
you couldn't have been noticing
he couldn't have been noticing
we couldn't have been noticing
you couldn't have been noticing
they couldn't have been noticing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I notice?
could you notice?
could he notice?
could we notice?
could you notice?
could they notice? 	could I be noticing?
could you be noticing?
could he be noticing?
could we be noticing?
could you be noticing?
could they be noticing? 	could I have noticed?
could you have noticed?
could he have noticed?
could we have noticed?
could you have noticed?
could they have noticed? 	could I have been noticing?
could you have been noticing?
could he have been noticing?
could we have been noticing?
could you have been noticing?
could they have been noticing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I notice?
couldn't you notice?
couldn't he notice?
couldn't we notice?
couldn't you notice?
couldn't they notice? 	couldn't I be noticing?
couldn't you be noticing?
couldn't he be noticing?
couldn't we be noticing?
couldn't you be noticing?
couldn't they be noticing? 	couldn't I have noticed?
couldn't you have noticed?
couldn't he have noticed?
couldn't we have noticed?
couldn't you have noticed?
couldn't they have noticed? 	couldn't I have been noticing?
couldn't you have been noticing?
couldn't he have been noticing?
couldn't we have been noticing?
couldn't you have been noticing?
couldn't they have been noticing?