can tack
Regular verb: tack - tacked- tacked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can tack
you can tack
he can tack
we can tack
you can tack
they can tack 	I can be tacking
you can be tacking
he can be tacking
we can be tacking
you can be tacking
they can be tacking	I can have tacked
you can have tacked
he can have tacked
we can have tacked
you can have tacked
they can have tacked	I can have been tacking
you can have been tacking
he can have been tacking
we can have been tacking
you can have been tacking
they can have been tacking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't tack
you can't tack
he can't tack
we can't tack
you can't tack
they can't tack 	I can't be tacking
you can't be tacking
he can't be tacking
we can't be tacking
you can't be tacking
they can't be tacking	I can't have tacked
you can't have tacked
he can't have tacked
we can't have tacked
you can't have tacked
they can't have tacked	I can't have been tacking
you can't have been tacking
he can't have been tacking
we can't have been tacking
you can't have been tacking
they can't have been tacking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I tack?
can you tack?
can he tack?
can we tack?
can you tack?
can they tack? 	can I be tacking?
can you be tacking?
can he be tacking?
can we be tacking?
can you be tacking?
can they be tacking? 	can I have tacked?
can you have tacked?
can he have tacked?
can we have tacked?
can you have tacked?
can they have tacked? 	can I have been tacking?
can you have been tacking?
can he have been tacking?
can we have been tacking?
can you have been tacking?
can they have been tacking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I tack?
can't you tack?
can't he tack?
can't we tack?
can't you tack?
can't they tack? 	can't I be tacking?
can't you be tacking?
can't he be tacking?
can't we be tacking?
can't you be tacking?
can't they be tacking? 	can't I have tacked?
can't you have tacked?
can't he have tacked?
can't we have tacked?
can't you have tacked?
can't they have tacked? 	can't I have been tacking?
can't you have been tacking?
can't he have been tacking?
can't we have been tacking?
can't you have been tacking?
can't they have been tacking?