English verb conjugation
CAN WARBLE

Regular verb: warble - warbled - warbled

Affirmation

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