can warble
Regular verb: warble - warbled- warbled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can warble
you can warble
he can warble
we can warble
you can warble
they can warble 	I can be warbling
you can be warbling
he can be warbling
we can be warbling
you can be warbling
they can be warbling	I can have warbled
you can have warbled
he 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
he 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 can't warble
you can't warble
he can't warble
we can't warble
you can't warble
they can't warble 	I can't be warbling
you can't be warbling
he can't be warbling
we can't be warbling
you can't be warbling
they can't be warbling	I can't have warbled
you can't have warbled
he can't have warbled
we can't have warbled
you can't have warbled
they can't have warbled	I can't have been warbling
you can't have been warbling
he can't have been warbling
we can't have been warbling
you can't have been warbling
they can't have been warbling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I warble?
can you warble?
can he warble?
can we warble?
can you warble?
can they warble? 	can I be warbling?
can you be warbling?
can he be warbling?
can we be warbling?
can you be warbling?
can they be warbling? 	can I have warbled?
can you have warbled?
can he 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 he 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't I warble?
can't you warble?
can't he warble?
can't we warble?
can't you warble?
can't they warble? 	can't I be warbling?
can't you be warbling?
can't he be warbling?
can't we be warbling?
can't you be warbling?
can't they be warbling? 	can't I have warbled?
can't you have warbled?
can't he have warbled?
can't we have warbled?
can't you have warbled?
can't they have warbled? 	can't I have been warbling?
can't you have been warbling?
can't he have been warbling?
can't we have been warbling?
can't you have been warbling?
can't they have been warbling?