English verb conjugation
CAN DOUBLE

Regular verb: double - doubled - doubled

Affirmation

Simple form	V-ing form
I can double you can double he can double we can double you can double they can double	I can be doubling you can be doubling he can be doubling we can be doubling you can be doubling they can be doubling
Perfect	V-ing perfect
I can have doubled you can have doubled he can have doubled we can have doubled you can have doubled they can have doubled	I can have been doubling you can have been doubling he can have been doubling we can have been doubling you can have been doubling they can have been doubling

Negation

Simple form	V-ing form
I cannot double you cannot double he cannot double we cannot double you cannot double they cannot double	I cannot be doubling you cannot be doubling he cannot be doubling we cannot be doubling you cannot be doubling they cannot be doubling
Perfect	V-ing perfect
I cannot have doubled you cannot have doubled he cannot have doubled we cannot have doubled you cannot have doubled they cannot have doubled	I cannot have been doubling you cannot have been doubling he cannot have been doubling we cannot have been doubling you cannot have been doubling they cannot have been doubling

Interrogative form

Simple form	V-ing form
can I double? can you double? can he double? can we double? can you double? can they double?	can I be doubling? can you be doubling? can he be doubling? can we be doubling? can you be doubling? can they be doubling?
Perfect	V-ing perfect
can I have doubled? can you have doubled? can he have doubled? can we have doubled? can you have doubled? can they have doubled?	can I have been doubling? can you have been doubling? can he have been doubling? can we have been doubling? can you have been doubling? can they have been doubling?

Interro-negative form

Simple form	V-ing form
can I not double? can you not double? can he not double? can we not double? can you not double? can they not double?	can I not be doubling? can you not be doubling? can he not be doubling? can we not be doubling? can you not be doubling? can they not be doubling?
Perfect	V-ing perfect
can I not have doubled? can you not have doubled? can he not have doubled? can we not have doubled? can you not have doubled? can they not have doubled?	can I not have been doubling? can you not have been doubling? can he not have been doubling? can we not have been doubling? can you not have been doubling? can they not have been doubling?