can tug
Regular verb: tug - tugged- tugged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can tug
you can tug
she can tug
we can tug
you can tug
they can tug 	I can be tugging
you can be tugging
she can be tugging
we can be tugging
you can be tugging
they can be tugging	I can have tugged
you can have tugged
she 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
she 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 	Perfect 	V-ing perfect 	
I cannot tug
you cannot tug
she cannot tug
we cannot tug
you cannot tug
they cannot tug 	I cannot be tugging
you cannot be tugging
she cannot be tugging
we cannot be tugging
you cannot be tugging
they cannot be tugging	I cannot have tugged
you cannot have tugged
she cannot have tugged
we cannot have tugged
you cannot have tugged
they cannot have tugged	I cannot have been tugging
you cannot have been tugging
she cannot have been tugging
we cannot have been tugging
you cannot have been tugging
they cannot have been tugging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I tug?
can you tug?
can she tug?
can we tug?
can you tug?
can they tug? 	can I be tugging?
can you be tugging?
can she be tugging?
can we be tugging?
can you be tugging?
can they be tugging? 	can I have tugged?
can you have tugged?
can she 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 she 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 	Perfect 	V-ing perfect 	
can I not tug?
can you not tug?
can she not tug?
can we not tug?
can you not tug?
can they not tug? 	can I not be tugging?
can you not be tugging?
can she not be tugging?
can we not be tugging?
can you not be tugging?
can they not be tugging? 	can I not have tugged?
can you not have tugged?
can she not have tugged?
can we not have tugged?
can you not have tugged?
can they not have tugged? 	can I not have been tugging?
can you not have been tugging?
can she not have been tugging?
can we not have been tugging?
can you not have been tugging?
can they not have been tugging?