could flock
Regular verb: flock - flocked- flocked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could flock
you could flock
she could flock
we could flock
you could flock
they could flock 	I could be flocking
you could be flocking
she could be flocking
we could be flocking
you could be flocking
they could be flocking	I could have flocked
you could have flocked
she could have flocked
we could have flocked
you could have flocked
they could have flocked	I could have been flocking
you could have been flocking
she could have been flocking
we could have been flocking
you could have been flocking
they could have been flocking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not flock
you could not flock
she could not flock
we could not flock
you could not flock
they could not flock 	I could not be flocking
you could not be flocking
she could not be flocking
we could not be flocking
you could not be flocking
they could not be flocking	I could not have flocked
you could not have flocked
she could not have flocked
we could not have flocked
you could not have flocked
they could not have flocked	I could not have been flocking
you could not have been flocking
she could not have been flocking
we could not have been flocking
you could not have been flocking
they could not have been flocking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I flock?
could you flock?
could she flock?
could we flock?
could you flock?
could they flock? 	could I be flocking?
could you be flocking?
could she be flocking?
could we be flocking?
could you be flocking?
could they be flocking? 	could I have flocked?
could you have flocked?
could she have flocked?
could we have flocked?
could you have flocked?
could they have flocked? 	could I have been flocking?
could you have been flocking?
could she have been flocking?
could we have been flocking?
could you have been flocking?
could they have been flocking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not flock?
could you not flock?
could she not flock?
could we not flock?
could you not flock?
could they not flock? 	could I not be flocking?
could you not be flocking?
could she not be flocking?
could we not be flocking?
could you not be flocking?
could they not be flocking? 	could I not have flocked?
could you not have flocked?
could she not have flocked?
could we not have flocked?
could you not have flocked?
could they not have flocked? 	could I not have been flocking?
could you not have been flocking?
could she not have been flocking?
could we not have been flocking?
could you not have been flocking?
could they not have been flocking?