English verb conjugation
CAN PLUMB

Regular verb: plumb - plumbed - plumbed

Affirmation

Simple form	V-ing form
I can plumb you can plumb he can plumb we can plumb you can plumb they can plumb	I can be plumbing you can be plumbing he can be plumbing we can be plumbing you can be plumbing they can be plumbing
Perfect	V-ing perfect
I can have plumbed you can have plumbed he can have plumbed we can have plumbed you can have plumbed they can have plumbed	I can have been plumbing you can have been plumbing he can have been plumbing we can have been plumbing you can have been plumbing they can have been plumbing

Negation

Simple form	V-ing form
I can't plumb you can't plumb he can't plumb we can't plumb you can't plumb they can't plumb	I can't be plumbing you can't be plumbing he can't be plumbing we can't be plumbing you can't be plumbing they can't be plumbing
Perfect	V-ing perfect
I can't have plumbed you can't have plumbed he can't have plumbed we can't have plumbed you can't have plumbed they can't have plumbed	I can't have been plumbing you can't have been plumbing he can't have been plumbing we can't have been plumbing you can't have been plumbing they can't have been plumbing

Interrogative form

Simple form	V-ing form
can I plumb? can you plumb? can he plumb? can we plumb? can you plumb? can they plumb?	can I be plumbing? can you be plumbing? can he be plumbing? can we be plumbing? can you be plumbing? can they be plumbing?
Perfect	V-ing perfect
can I have plumbed? can you have plumbed? can he have plumbed? can we have plumbed? can you have plumbed? can they have plumbed?	can I have been plumbing? can you have been plumbing? can he have been plumbing? can we have been plumbing? can you have been plumbing? can they have been plumbing?

Interro-negative form

Simple form	V-ing form
can't I plumb? can't you plumb? can't he plumb? can't we plumb? can't you plumb? can't they plumb?	can't I be plumbing? can't you be plumbing? can't he be plumbing? can't we be plumbing? can't you be plumbing? can't they be plumbing?
Perfect	V-ing perfect
can't I have plumbed? can't you have plumbed? can't he have plumbed? can't we have plumbed? can't you have plumbed? can't they have plumbed?	can't I have been plumbing? can't you have been plumbing? can't he have been plumbing? can't we have been plumbing? can't you have been plumbing? can't they have been plumbing?