English verb conjugation
CAN TUG

Regular verb: tug - tugged - tugged

Affirmation

Simple form	V-ing form
I can tug you can tug he can tug we can tug you can tug they can tug	I can be tugging you can be tugging he can be tugging we can be tugging you can be tugging they can be tugging
Perfect	V-ing perfect
I can have tugged you can have tugged he can have tugged we can have tugged you can have tugged they can have tugged	I can have been tugging you can have been tugging he can have been tugging we can have been tugging you can have been tugging they can have been tugging

Negation

Simple form	V-ing form
I can't tug you can't tug he can't tug we can't tug you can't tug they can't tug	I can't be tugging you can't be tugging he can't be tugging we can't be tugging you can't be tugging they can't be tugging
Perfect	V-ing perfect
I can't have tugged you can't have tugged he can't have tugged we can't have tugged you can't have tugged they can't have tugged	I can't have been tugging you can't have been tugging he can't have been tugging we can't have been tugging you can't have been tugging they can't have been tugging

Interrogative form

Simple form	V-ing form
can I tug? can you tug? can he tug? can we tug? can you tug? can they tug?	can I be tugging? can you be tugging? can he be tugging? can we be tugging? can you be tugging? can they be tugging?
Perfect	V-ing perfect
can I have tugged? can you have tugged? can he have tugged? can we have tugged? can you have tugged? can they have tugged?	can I have been tugging? can you have been tugging? can he have been tugging? can we have been tugging? can you have been tugging? can they have been tugging?

Interro-negative form

Simple form	V-ing form
can't I tug? can't you tug? can't he tug? can't we tug? can't you tug? can't they tug?	can't I be tugging? can't you be tugging? can't he be tugging? can't we be tugging? can't you be tugging? can't they be tugging?
Perfect	V-ing perfect
can't I have tugged? can't you have tugged? can't he have tugged? can't we have tugged? can't you have tugged? can't they have tugged?	can't I have been tugging? can't you have been tugging? can't he have been tugging? can't we have been tugging? can't you have been tugging? can't they have been tugging?