can flack
Regular verb: flack - flacked- flacked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can flack
you can flack
he can flack
we can flack
you can flack
they can flack 	I can be flacking
you can be flacking
he can be flacking
we can be flacking
you can be flacking
they can be flacking	I can have flacked
you can have flacked
he can have flacked
we can have flacked
you can have flacked
they can have flacked	I can have been flacking
you can have been flacking
he can have been flacking
we can have been flacking
you can have been flacking
they can have been flacking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't flack
you can't flack
he can't flack
we can't flack
you can't flack
they can't flack 	I can't be flacking
you can't be flacking
he can't be flacking
we can't be flacking
you can't be flacking
they can't be flacking	I can't have flacked
you can't have flacked
he can't have flacked
we can't have flacked
you can't have flacked
they can't have flacked	I can't have been flacking
you can't have been flacking
he can't have been flacking
we can't have been flacking
you can't have been flacking
they can't have been flacking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I flack?
can you flack?
can he flack?
can we flack?
can you flack?
can they flack? 	can I be flacking?
can you be flacking?
can he be flacking?
can we be flacking?
can you be flacking?
can they be flacking? 	can I have flacked?
can you have flacked?
can he have flacked?
can we have flacked?
can you have flacked?
can they have flacked? 	can I have been flacking?
can you have been flacking?
can he have been flacking?
can we have been flacking?
can you have been flacking?
can they have been flacking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I flack?
can't you flack?
can't he flack?
can't we flack?
can't you flack?
can't they flack? 	can't I be flacking?
can't you be flacking?
can't he be flacking?
can't we be flacking?
can't you be flacking?
can't they be flacking? 	can't I have flacked?
can't you have flacked?
can't he have flacked?
can't we have flacked?
can't you have flacked?
can't they have flacked? 	can't I have been flacking?
can't you have been flacking?
can't he have been flacking?
can't we have been flacking?
can't you have been flacking?
can't they have been flacking?