English verb conjugation
CAN CURVE

Regular verb: curve - curved - curved

Affirmation

Simple form	V-ing form
I can curve you can curve he can curve we can curve you can curve they can curve	I can be curving you can be curving he can be curving we can be curving you can be curving they can be curving
Perfect	V-ing perfect
I can have curved you can have curved he can have curved we can have curved you can have curved they can have curved	I can have been curving you can have been curving he can have been curving we can have been curving you can have been curving they can have been curving

Negation

Simple form	V-ing form
I can't curve you can't curve he can't curve we can't curve you can't curve they can't curve	I can't be curving you can't be curving he can't be curving we can't be curving you can't be curving they can't be curving
Perfect	V-ing perfect
I can't have curved you can't have curved he can't have curved we can't have curved you can't have curved they can't have curved	I can't have been curving you can't have been curving he can't have been curving we can't have been curving you can't have been curving they can't have been curving

Interrogative form

Simple form	V-ing form
can I curve? can you curve? can he curve? can we curve? can you curve? can they curve?	can I be curving? can you be curving? can he be curving? can we be curving? can you be curving? can they be curving?
Perfect	V-ing perfect
can I have curved? can you have curved? can he have curved? can we have curved? can you have curved? can they have curved?	can I have been curving? can you have been curving? can he have been curving? can we have been curving? can you have been curving? can they have been curving?

Interro-negative form

Simple form	V-ing form
can't I curve? can't you curve? can't he curve? can't we curve? can't you curve? can't they curve?	can't I be curving? can't you be curving? can't he be curving? can't we be curving? can't you be curving? can't they be curving?
Perfect	V-ing perfect
can't I have curved? can't you have curved? can't he have curved? can't we have curved? can't you have curved? can't they have curved?	can't I have been curving? can't you have been curving? can't he have been curving? can't we have been curving? can't you have been curving? can't they have been curving?