can calculate
Regular verb: calculate - calculated- calculated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?