I can tack you can tack he can tack we can tack you can tack they can tack
V-ing form
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
I can have tacked you can have tacked he can have tacked we can have tacked you can have tacked they can have tacked
V-ing perfect
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
I can't tack you can't tack he can't tack we can't tack you can't tack they can't tack
V-ing form
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
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
V-ing perfect
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
can I tack? can you tack? can he tack? can we tack? can you tack? can they tack?
V-ing form
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
can I have tacked? can you have tacked? can he have tacked? can we have tacked? can you have tacked? can they have tacked?
V-ing perfect
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
can't I tack? can't you tack? can't he tack? can't we tack? can't you tack? can't they tack?
V-ing form
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
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?
V-ing perfect
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?