English verb conjugation
CAN CURR

Regular verb: curr - curred - curred

Affirmation

Simple form	V-ing form
I can curr you can curr he can curr we can curr you can curr they can curr	I can be curring you can be curring he can be curring we can be curring you can be curring they can be curring
Perfect	V-ing perfect
I can have curred you can have curred he can have curred we can have curred you can have curred they can have curred	I can have been curring you can have been curring he can have been curring we can have been curring you can have been curring they can have been curring

Negation

Simple form	V-ing form
I cannot curr you cannot curr he cannot curr we cannot curr you cannot curr they cannot curr	I cannot be curring you cannot be curring he cannot be curring we cannot be curring you cannot be curring they cannot be curring
Perfect	V-ing perfect
I cannot have curred you cannot have curred he cannot have curred we cannot have curred you cannot have curred they cannot have curred	I cannot have been curring you cannot have been curring he cannot have been curring we cannot have been curring you cannot have been curring they cannot have been curring

Interrogative form

Simple form	V-ing form
can I curr? can you curr? can he curr? can we curr? can you curr? can they curr?	can I be curring? can you be curring? can he be curring? can we be curring? can you be curring? can they be curring?
Perfect	V-ing perfect
can I have curred? can you have curred? can he have curred? can we have curred? can you have curred? can they have curred?	can I have been curring? can you have been curring? can he have been curring? can we have been curring? can you have been curring? can they have been curring?

Interro-negative form

Simple form	V-ing form
can I not curr? can you not curr? can he not curr? can we not curr? can you not curr? can they not curr?	can I not be curring? can you not be curring? can he not be curring? can we not be curring? can you not be curring? can they not be curring?
Perfect	V-ing perfect
can I not have curred? can you not have curred? can he not have curred? can we not have curred? can you not have curred? can they not have curred?	can I not have been curring? can you not have been curring? can he not have been curring? can we not have been curring? can you not have been curring? can they not have been curring?