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 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
Perfect	V-ing perfect
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
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'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?
Perfect	V-ing perfect
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?