I can tub you can tub he can tub we can tub you can tub they can tub
Forma con V-ing
I can be tubbing you can be tubbing he can be tubbing we can be tubbing you can be tubbing they can be tubbing
Perfecto
I can have tubbed you can have tubbed he can have tubbed we can have tubbed you can have tubbed they can have tubbed
Perfecto con V-ing
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
Negación
Forma simple
I cannot tub you cannot tub he cannot tub we cannot tub you cannot tub they cannot tub
Forma con V-ing
I cannot be tubbing you cannot be tubbing he cannot be tubbing we cannot be tubbing you cannot be tubbing they cannot be tubbing
Perfecto
I cannot have tubbed you cannot have tubbed he cannot have tubbed we cannot have tubbed you cannot have tubbed they cannot have tubbed
Perfecto con V-ing
I cannot have been tubbing you cannot have been tubbing he cannot have been tubbing we cannot have been tubbing you cannot have been tubbing they cannot have been tubbing
Forma interrogativa
Forma simple
can I tub? can you tub? can he tub? can we tub? can you tub? can they tub?
Forma con V-ing
can I be tubbing? can you be tubbing? can he be tubbing? can we be tubbing? can you be tubbing? can they be tubbing?
Perfecto
can I have tubbed? can you have tubbed? can he have tubbed? can we have tubbed? can you have tubbed? can they have tubbed?
Perfecto con V-ing
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?
Forma interro-negativa
Forma simple
can I not tub? can you not tub? can he not tub? can we not tub? can you not tub? can they not tub?
Forma con V-ing
can I not be tubbing? can you not be tubbing? can he not be tubbing? can we not be tubbing? can you not be tubbing? can they not be tubbing?
Perfecto
can I not have tubbed? can you not have tubbed? can he not have tubbed? can we not have tubbed? can you not have tubbed? can they not have tubbed?
Perfecto con V-ing
can I not have been tubbing? can you not have been tubbing? can he not have been tubbing? can we not have been tubbing? can you not have been tubbing? can they not have been tubbing?