English verb conjugation
CAN CALCULATE

Regular verb: calculate - calculated - calculated

Affirmation

Simple form	V-ing form
I can calculate you can calculate she can calculate we can calculate you can calculate they can calculate	I can be calculating you can be calculating she 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 she 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 she 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 she 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 she 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 she 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 she 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 she calculate? can we calculate? can you calculate? can they calculate?	can I be calculating? can you be calculating? can she 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 she 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 she 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 she 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 she 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 she 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 she have been calculating? can't we have been calculating? can't you have been calculating? can't they have been calculating?