can tub
Regular verb: tub - tubbed- tubbed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can tub
you can tub
he can tub
we can tub
you can tub
they can tub 	I can be tubbing
you can be tubbing
he can be tubbing
we can be tubbing
you can be tubbing
they can be tubbing	I can have tubbed
you can have tubbed
he can have tubbed
we can have tubbed
you can have tubbed
they can have tubbed	I can have been tubbing
you can have been tubbing
he can have been tubbing
we can have been tubbing
you can have been tubbing
they can have been tubbing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't tub
you can't tub
he can't tub
we can't tub
you can't tub
they can't tub 	I can't be tubbing
you can't be tubbing
he can't be tubbing
we can't be tubbing
you can't be tubbing
they can't be tubbing	I can't have tubbed
you can't have tubbed
he can't have tubbed
we can't have tubbed
you can't have tubbed
they can't have tubbed	I can't have been tubbing
you can't have been tubbing
he can't have been tubbing
we can't have been tubbing
you can't have been tubbing
they can't have been tubbing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I tub?
can you tub?
can he tub?
can we tub?
can you tub?
can they tub? 	can I be tubbing?
can you be tubbing?
can he be tubbing?
can we be tubbing?
can you be tubbing?
can they be tubbing? 	can I have tubbed?
can you have tubbed?
can he have tubbed?
can we have tubbed?
can you have tubbed?
can they have tubbed? 	can I have been tubbing?
can you have been tubbing?
can he have been tubbing?
can we have been tubbing?
can you have been tubbing?
can they have been tubbing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I tub?
can't you tub?
can't he tub?
can't we tub?
can't you tub?
can't they tub? 	can't I be tubbing?
can't you be tubbing?
can't he be tubbing?
can't we be tubbing?
can't you be tubbing?
can't they be tubbing? 	can't I have tubbed?
can't you have tubbed?
can't he have tubbed?
can't we have tubbed?
can't you have tubbed?
can't they have tubbed? 	can't I have been tubbing?
can't you have been tubbing?
can't he have been tubbing?
can't we have been tubbing?
can't you have been tubbing?
can't they have been tubbing?