could tub
Verbo regular: tub - tubbed- tubbed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could tub
you could tub
he could tub
we could tub
you could tub
they could tub 	I could be tubbing
you could be tubbing
he could be tubbing
we could be tubbing
you could be tubbing
they could be tubbing	I could have tubbed
you could have tubbed
he could have tubbed
we could have tubbed
you could have tubbed
they could have tubbed	I could have been tubbing
you could have been tubbing
he could have been tubbing
we could have been tubbing
you could have been tubbing
they could have been tubbing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not tub
you could not tub
he could not tub
we could not tub
you could not tub
they could not tub 	I could not be tubbing
you could not be tubbing
he could not be tubbing
we could not be tubbing
you could not be tubbing
they could not be tubbing	I could not have tubbed
you could not have tubbed
he could not have tubbed
we could not have tubbed
you could not have tubbed
they could not have tubbed	I could not have been tubbing
you could not have been tubbing
he could not have been tubbing
we could not have been tubbing
you could not have been tubbing
they could not have been tubbing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I tub?
could you tub?
could he tub?
could we tub?
could you tub?
could they tub? 	could I be tubbing?
could you be tubbing?
could he be tubbing?
could we be tubbing?
could you be tubbing?
could they be tubbing? 	could I have tubbed?
could you have tubbed?
could he have tubbed?
could we have tubbed?
could you have tubbed?
could they have tubbed? 	could I have been tubbing?
could you have been tubbing?
could he have been tubbing?
could we have been tubbing?
could you have been tubbing?
could they have been tubbing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not tub?
could you not tub?
could he not tub?
could we not tub?
could you not tub?
could they not tub? 	could I not be tubbing?
could you not be tubbing?
could he not be tubbing?
could we not be tubbing?
could you not be tubbing?
could they not be tubbing? 	could I not have tubbed?
could you not have tubbed?
could he not have tubbed?
could we not have tubbed?
could you not have tubbed?
could they not have tubbed? 	could I not have been tubbing?
could you not have been tubbing?
could he not have been tubbing?
could we not have been tubbing?
could you not have been tubbing?
could they not have been tubbing?