can drub
Regular verb: drub - drubbed- drubbed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can drub
you can drub
she can drub
we can drub
you can drub
they can drub 	I can be drubbing
you can be drubbing
she can be drubbing
we can be drubbing
you can be drubbing
they can be drubbing	I can have drubbed
you can have drubbed
she 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
she 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 	Perfect 	V-ing perfect 	
I cannot drub
you cannot drub
she cannot drub
we cannot drub
you cannot drub
they cannot drub 	I cannot be drubbing
you cannot be drubbing
she cannot be drubbing
we cannot be drubbing
you cannot be drubbing
they cannot be drubbing	I cannot have drubbed
you cannot have drubbed
she cannot have drubbed
we cannot have drubbed
you cannot have drubbed
they cannot have drubbed	I cannot have been drubbing
you cannot have been drubbing
she cannot have been drubbing
we cannot have been drubbing
you cannot have been drubbing
they cannot have been drubbing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I drub?
can you drub?
can she drub?
can we drub?
can you drub?
can they drub? 	can I be drubbing?
can you be drubbing?
can she be drubbing?
can we be drubbing?
can you be drubbing?
can they be drubbing? 	can I have drubbed?
can you have drubbed?
can she 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 she 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 	Perfect 	V-ing perfect 	
can I not drub?
can you not drub?
can she not drub?
can we not drub?
can you not drub?
can they not drub? 	can I not be drubbing?
can you not be drubbing?
can she not be drubbing?
can we not be drubbing?
can you not be drubbing?
can they not be drubbing? 	can I not have drubbed?
can you not have drubbed?
can she not have drubbed?
can we not have drubbed?
can you not have drubbed?
can they not have drubbed? 	can I not have been drubbing?
can you not have been drubbing?
can she not have been drubbing?
can we not have been drubbing?
can you not have been drubbing?
can they not have been drubbing?