English verb conjugation
CAN TUBE

Regular verb: tube - tubed - tubed

Affirmation

Simple form	V-ing form
I can tube you can tube she can tube we can tube you can tube they can tube	I can be tubing you can be tubing she can be tubing we can be tubing you can be tubing they can be tubing
Perfect	V-ing perfect
I can have tubed you can have tubed she can have tubed we can have tubed you can have tubed they can have tubed	I can have been tubing you can have been tubing she can have been tubing we can have been tubing you can have been tubing they can have been tubing

Negation

Simple form	V-ing form
I can't tube you can't tube she can't tube we can't tube you can't tube they can't tube	I can't be tubing you can't be tubing she can't be tubing we can't be tubing you can't be tubing they can't be tubing
Perfect	V-ing perfect
I can't have tubed you can't have tubed she can't have tubed we can't have tubed you can't have tubed they can't have tubed	I can't have been tubing you can't have been tubing she can't have been tubing we can't have been tubing you can't have been tubing they can't have been tubing

Interrogative form

Simple form	V-ing form
can I tube? can you tube? can she tube? can we tube? can you tube? can they tube?	can I be tubing? can you be tubing? can she be tubing? can we be tubing? can you be tubing? can they be tubing?
Perfect	V-ing perfect
can I have tubed? can you have tubed? can she have tubed? can we have tubed? can you have tubed? can they have tubed?	can I have been tubing? can you have been tubing? can she have been tubing? can we have been tubing? can you have been tubing? can they have been tubing?

Interro-negative form

Simple form	V-ing form
can't I tube? can't you tube? can't she tube? can't we tube? can't you tube? can't they tube?	can't I be tubing? can't you be tubing? can't she be tubing? can't we be tubing? can't you be tubing? can't they be tubing?
Perfect	V-ing perfect
can't I have tubed? can't you have tubed? can't she have tubed? can't we have tubed? can't you have tubed? can't they have tubed?	can't I have been tubing? can't you have been tubing? can't she have been tubing? can't we have been tubing? can't you have been tubing? can't they have been tubing?