could compare
Regular verb: compare - compared- compared

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could compare
you could compare
she could compare
we could compare
you could compare
they could compare 	I could be comparing
you could be comparing
she could be comparing
we could be comparing
you could be comparing
they could be comparing	I could have compared
you could have compared
she could have compared
we could have compared
you could have compared
they could have compared	I could have been comparing
you could have been comparing
she could have been comparing
we could have been comparing
you could have been comparing
they could have been comparing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not compare
you could not compare
she could not compare
we could not compare
you could not compare
they could not compare 	I could not be comparing
you could not be comparing
she could not be comparing
we could not be comparing
you could not be comparing
they could not be comparing	I could not have compared
you could not have compared
she could not have compared
we could not have compared
you could not have compared
they could not have compared	I could not have been comparing
you could not have been comparing
she could not have been comparing
we could not have been comparing
you could not have been comparing
they could not have been comparing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I compare?
could you compare?
could she compare?
could we compare?
could you compare?
could they compare? 	could I be comparing?
could you be comparing?
could she be comparing?
could we be comparing?
could you be comparing?
could they be comparing? 	could I have compared?
could you have compared?
could she have compared?
could we have compared?
could you have compared?
could they have compared? 	could I have been comparing?
could you have been comparing?
could she have been comparing?
could we have been comparing?
could you have been comparing?
could they have been comparing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not compare?
could you not compare?
could she not compare?
could we not compare?
could you not compare?
could they not compare? 	could I not be comparing?
could you not be comparing?
could she not be comparing?
could we not be comparing?
could you not be comparing?
could they not be comparing? 	could I not have compared?
could you not have compared?
could she not have compared?
could we not have compared?
could you not have compared?
could they not have compared? 	could I not have been comparing?
could you not have been comparing?
could she not have been comparing?
could we not have been comparing?
could you not have been comparing?
could they not have been comparing?