can flock
Regular verb: flock - flocked- flocked

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

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

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

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