can warble
Regular verb: warble - warbled- warbled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can warble
you can warble
she can warble
we can warble
you can warble
they can warble 	I can be warbling
you can be warbling
she can be warbling
we can be warbling
you can be warbling
they can be warbling	I can have warbled
you can have warbled
she can have warbled
we can have warbled
you can have warbled
they can have warbled	I can have been warbling
you can have been warbling
she can have been warbling
we can have been warbling
you can have been warbling
they can have been warbling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot warble
you cannot warble
she cannot warble
we cannot warble
you cannot warble
they cannot warble 	I cannot be warbling
you cannot be warbling
she cannot be warbling
we cannot be warbling
you cannot be warbling
they cannot be warbling	I cannot have warbled
you cannot have warbled
she cannot have warbled
we cannot have warbled
you cannot have warbled
they cannot have warbled	I cannot have been warbling
you cannot have been warbling
she cannot have been warbling
we cannot have been warbling
you cannot have been warbling
they cannot have been warbling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I warble?
can you warble?
can she warble?
can we warble?
can you warble?
can they warble? 	can I be warbling?
can you be warbling?
can she be warbling?
can we be warbling?
can you be warbling?
can they be warbling? 	can I have warbled?
can you have warbled?
can she have warbled?
can we have warbled?
can you have warbled?
can they have warbled? 	can I have been warbling?
can you have been warbling?
can she have been warbling?
can we have been warbling?
can you have been warbling?
can they have been warbling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not warble?
can you not warble?
can she not warble?
can we not warble?
can you not warble?
can they not warble? 	can I not be warbling?
can you not be warbling?
can she not be warbling?
can we not be warbling?
can you not be warbling?
can they not be warbling? 	can I not have warbled?
can you not have warbled?
can she not have warbled?
can we not have warbled?
can you not have warbled?
can they not have warbled? 	can I not have been warbling?
can you not have been warbling?
can she not have been warbling?
can we not have been warbling?
can you not have been warbling?
can they not have been warbling?