can tack
Regular verb: tack - tacked- tacked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can tack
you can tack
she can tack
we can tack
you can tack
they can tack 	I can be tacking
you can be tacking
she can be tacking
we can be tacking
you can be tacking
they can be tacking	I can have tacked
you can have tacked
she 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
she 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 cannot tack
you cannot tack
she cannot tack
we cannot tack
you cannot tack
they cannot tack 	I cannot be tacking
you cannot be tacking
she cannot be tacking
we cannot be tacking
you cannot be tacking
they cannot be tacking	I cannot have tacked
you cannot have tacked
she cannot have tacked
we cannot have tacked
you cannot have tacked
they cannot have tacked	I cannot have been tacking
you cannot have been tacking
she cannot have been tacking
we cannot have been tacking
you cannot have been tacking
they cannot have been tacking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I tack?
can you tack?
can she tack?
can we tack?
can you tack?
can they tack? 	can I be tacking?
can you be tacking?
can she be tacking?
can we be tacking?
can you be tacking?
can they be tacking? 	can I have tacked?
can you have tacked?
can she 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 she 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 I not tack?
can you not tack?
can she not tack?
can we not tack?
can you not tack?
can they not tack? 	can I not be tacking?
can you not be tacking?
can she not be tacking?
can we not be tacking?
can you not be tacking?
can they not be tacking? 	can I not have tacked?
can you not have tacked?
can she not have tacked?
can we not have tacked?
can you not have tacked?
can they not have tacked? 	can I not have been tacking?
can you not have been tacking?
can she not have been tacking?
can we not have been tacking?
can you not have been tacking?
can they not have been tacking?