English verb conjugation
CAN DRUB

Regular verb: drub - drubbed - drubbed

Affirmation

Simple form	V-ing form
I can drub you can drub he can drub we can drub you can drub they can drub	I can be drubbing you can be drubbing he can be drubbing we can be drubbing you can be drubbing they can be drubbing
Perfect	V-ing perfect
I can have drubbed you can have drubbed he can have drubbed we can have drubbed you can have drubbed they can have drubbed	I can have been drubbing you can have been drubbing he can have been drubbing we can have been drubbing you can have been drubbing they can have been drubbing

Negation

Simple form	V-ing form
I can't drub you can't drub he can't drub we can't drub you can't drub they can't drub	I can't be drubbing you can't be drubbing he can't be drubbing we can't be drubbing you can't be drubbing they can't be drubbing
Perfect	V-ing perfect
I can't have drubbed you can't have drubbed he can't have drubbed we can't have drubbed you can't have drubbed they can't have drubbed	I can't have been drubbing you can't have been drubbing he can't have been drubbing we can't have been drubbing you can't have been drubbing they can't have been drubbing

Interrogative form

Simple form	V-ing form
can I drub? can you drub? can he drub? can we drub? can you drub? can they drub?	can I be drubbing? can you be drubbing? can he be drubbing? can we be drubbing? can you be drubbing? can they be drubbing?
Perfect	V-ing perfect
can I have drubbed? can you have drubbed? can he have drubbed? can we have drubbed? can you have drubbed? can they have drubbed?	can I have been drubbing? can you have been drubbing? can he have been drubbing? can we have been drubbing? can you have been drubbing? can they have been drubbing?

Interro-negative form

Simple form	V-ing form
can't I drub? can't you drub? can't he drub? can't we drub? can't you drub? can't they drub?	can't I be drubbing? can't you be drubbing? can't he be drubbing? can't we be drubbing? can't you be drubbing? can't they be drubbing?
Perfect	V-ing perfect
can't I have drubbed? can't you have drubbed? can't he have drubbed? can't we have drubbed? can't you have drubbed? can't they have drubbed?	can't I have been drubbing? can't you have been drubbing? can't he have been drubbing? can't we have been drubbing? can't you have been drubbing? can't they have been drubbing?