could fife
Regular verb: fife - fifed- fifed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could fife
you could fife
she could fife
we could fife
you could fife
they could fife 	I could be fifing
you could be fifing
she could be fifing
we could be fifing
you could be fifing
they could be fifing	I could have fifed
you could have fifed
she could have fifed
we could have fifed
you could have fifed
they could have fifed	I could have been fifing
you could have been fifing
she could have been fifing
we could have been fifing
you could have been fifing
they could have been fifing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not fife
you could not fife
she could not fife
we could not fife
you could not fife
they could not fife 	I could not be fifing
you could not be fifing
she could not be fifing
we could not be fifing
you could not be fifing
they could not be fifing	I could not have fifed
you could not have fifed
she could not have fifed
we could not have fifed
you could not have fifed
they could not have fifed	I could not have been fifing
you could not have been fifing
she could not have been fifing
we could not have been fifing
you could not have been fifing
they could not have been fifing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I fife?
could you fife?
could she fife?
could we fife?
could you fife?
could they fife? 	could I be fifing?
could you be fifing?
could she be fifing?
could we be fifing?
could you be fifing?
could they be fifing? 	could I have fifed?
could you have fifed?
could she have fifed?
could we have fifed?
could you have fifed?
could they have fifed? 	could I have been fifing?
could you have been fifing?
could she have been fifing?
could we have been fifing?
could you have been fifing?
could they have been fifing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not fife?
could you not fife?
could she not fife?
could we not fife?
could you not fife?
could they not fife? 	could I not be fifing?
could you not be fifing?
could she not be fifing?
could we not be fifing?
could you not be fifing?
could they not be fifing? 	could I not have fifed?
could you not have fifed?
could she not have fifed?
could we not have fifed?
could you not have fifed?
could they not have fifed? 	could I not have been fifing?
could you not have been fifing?
could she not have been fifing?
could we not have been fifing?
could you not have been fifing?
could they not have been fifing?