I can calculate you can calculate he can calculate we can calculate you can calculate they can calculate
V-ing form
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
I can have calculated you can have calculated he can have calculated we can have calculated you can have calculated they can have calculated
V-ing perfect
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
I can't calculate you can't calculate he can't calculate we can't calculate you can't calculate they can't calculate
V-ing form
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
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
V-ing perfect
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
can I calculate? can you calculate? can he calculate? can we calculate? can you calculate? can they calculate?
V-ing form
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
can I have calculated? can you have calculated? can he have calculated? can we have calculated? can you have calculated? can they have calculated?
V-ing perfect
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
can't I calculate? can't you calculate? can't he calculate? can't we calculate? can't you calculate? can't they calculate?
V-ing form
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
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?
V-ing perfect
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?