English verb conjugation
CAN TACK

Regular verb: tack - tacked - tacked

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
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
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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?