Conjugación del verbo inglés
COULD TUBE

Verbo regular: tube - tubed - tubed

Afirmación

Forma simple	Forma con V-ing
I could tube you could tube he could tube we could tube you could tube they could tube	I could be tubing you could be tubing he could be tubing we could be tubing you could be tubing they could be tubing
Perfecto	Perfecto con V-ing
I could have tubed you could have tubed he could have tubed we could have tubed you could have tubed they could have tubed	I could have been tubing you could have been tubing he could have been tubing we could have been tubing you could have been tubing they could have been tubing

Negación

Forma simple	Forma con V-ing
I could not tube you could not tube he could not tube we could not tube you could not tube they could not tube	I could not be tubing you could not be tubing he could not be tubing we could not be tubing you could not be tubing they could not be tubing
Perfecto	Perfecto con V-ing
I could not have tubed you could not have tubed he could not have tubed we could not have tubed you could not have tubed they could not have tubed	I could not have been tubing you could not have been tubing he could not have been tubing we could not have been tubing you could not have been tubing they could not have been tubing

Forma interrogativa

Forma simple	Forma con V-ing
could I tube? could you tube? could he tube? could we tube? could you tube? could they tube?	could I be tubing? could you be tubing? could he be tubing? could we be tubing? could you be tubing? could they be tubing?
Perfecto	Perfecto con V-ing
could I have tubed? could you have tubed? could he have tubed? could we have tubed? could you have tubed? could they have tubed?	could I have been tubing? could you have been tubing? could he have been tubing? could we have been tubing? could you have been tubing? could they have been tubing?

Forma interro-negativa

Forma simple	Forma con V-ing
could I not tube? could you not tube? could he not tube? could we not tube? could you not tube? could they not tube?	could I not be tubing? could you not be tubing? could he not be tubing? could we not be tubing? could you not be tubing? could they not be tubing?
Perfecto	Perfecto con V-ing
could I not have tubed? could you not have tubed? could he not have tubed? could we not have tubed? could you not have tubed? could they not have tubed?	could I not have been tubing? could you not have been tubing? could he not have been tubing? could we not have been tubing? could you not have been tubing? could they not have been tubing?