English verb conjugation
CAN CALCULATE

Regular verb: calculate - calculated - calculated

Affirmation

Simple form	V-ing form
I can calculate you can calculate he can calculate we can calculate you can calculate they can calculate	I can be calculating you can be calculating he can be calculating we can be calculating you can be calculating they can be calculating
Perfect	V-ing perfect
I can have calculated you can have calculated he can have calculated we can have calculated you can have calculated they can have calculated	I can have been calculating you can have been calculating he can have been calculating we can have been calculating you can have been calculating they can have been calculating

Negation

Simple form	V-ing form
I can't calculate you can't calculate he can't calculate we can't calculate you can't calculate they can't calculate	I can't be calculating you can't be calculating he can't be calculating we can't be calculating you can't be calculating they can't be calculating
Perfect	V-ing perfect
I can't have calculated you can't have calculated he can't have calculated we can't have calculated you can't have calculated they can't have calculated	I can't have been calculating you can't have been calculating he can't have been calculating we can't have been calculating you can't have been calculating they can't have been calculating

Interrogative form

Simple form	V-ing form
can I calculate? can you calculate? can he calculate? can we calculate? can you calculate? can they calculate?	can I be calculating? can you be calculating? can he be calculating? can we be calculating? can you be calculating? can they be calculating?
Perfect	V-ing perfect
can I have calculated? can you have calculated? can he have calculated? can we have calculated? can you have calculated? can they have calculated?	can I have been calculating? can you have been calculating? can he have been calculating? can we have been calculating? can you have been calculating? can they have been calculating?

Interro-negative form

Simple form	V-ing form
can't I calculate? can't you calculate? can't he calculate? can't we calculate? can't you calculate? can't they calculate?	can't I be calculating? can't you be calculating? can't he be calculating? can't we be calculating? can't you be calculating? can't they be calculating?
Perfect	V-ing perfect
can't I have calculated? can't you have calculated? can't he have calculated? can't we have calculated? can't you have calculated? can't they have calculated?	can't I have been calculating? can't you have been calculating? can't he have been calculating? can't we have been calculating? can't you have been calculating? can't they have been calculating?