could narrow
Regular verb: narrow - narrowed- narrowed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could narrow
you could narrow
he could narrow
we could narrow
you could narrow
they could narrow 	I could be narrowing
you could be narrowing
he could be narrowing
we could be narrowing
you could be narrowing
they could be narrowing	I could have narrowed
you could have narrowed
he could have narrowed
we could have narrowed
you could have narrowed
they could have narrowed	I could have been narrowing
you could have been narrowing
he could have been narrowing
we could have been narrowing
you could have been narrowing
they could have been narrowing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not narrow
you could not narrow
he could not narrow
we could not narrow
you could not narrow
they could not narrow 	I could not be narrowing
you could not be narrowing
he could not be narrowing
we could not be narrowing
you could not be narrowing
they could not be narrowing	I could not have narrowed
you could not have narrowed
he could not have narrowed
we could not have narrowed
you could not have narrowed
they could not have narrowed	I could not have been narrowing
you could not have been narrowing
he could not have been narrowing
we could not have been narrowing
you could not have been narrowing
they could not have been narrowing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I narrow?
could you narrow?
could he narrow?
could we narrow?
could you narrow?
could they narrow? 	could I be narrowing?
could you be narrowing?
could he be narrowing?
could we be narrowing?
could you be narrowing?
could they be narrowing? 	could I have narrowed?
could you have narrowed?
could he have narrowed?
could we have narrowed?
could you have narrowed?
could they have narrowed? 	could I have been narrowing?
could you have been narrowing?
could he have been narrowing?
could we have been narrowing?
could you have been narrowing?
could they have been narrowing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not narrow?
could you not narrow?
could he not narrow?
could we not narrow?
could you not narrow?
could they not narrow? 	could I not be narrowing?
could you not be narrowing?
could he not be narrowing?
could we not be narrowing?
could you not be narrowing?
could they not be narrowing? 	could I not have narrowed?
could you not have narrowed?
could he not have narrowed?
could we not have narrowed?
could you not have narrowed?
could they not have narrowed? 	could I not have been narrowing?
could you not have been narrowing?
could he not have been narrowing?
could we not have been narrowing?
could you not have been narrowing?
could they not have been narrowing?