can subtract
Regular verb: subtract - subtracted- subtracted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can subtract
you can subtract
he can subtract
we can subtract
you can subtract
they can subtract 	I can be subtracting
you can be subtracting
he can be subtracting
we can be subtracting
you can be subtracting
they can be subtracting	I can have subtracted
you can have subtracted
he can have subtracted
we can have subtracted
you can have subtracted
they can have subtracted	I can have been subtracting
you can have been subtracting
he can have been subtracting
we can have been subtracting
you can have been subtracting
they can have been subtracting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot subtract
you cannot subtract
he cannot subtract
we cannot subtract
you cannot subtract
they cannot subtract 	I cannot be subtracting
you cannot be subtracting
he cannot be subtracting
we cannot be subtracting
you cannot be subtracting
they cannot be subtracting	I cannot have subtracted
you cannot have subtracted
he cannot have subtracted
we cannot have subtracted
you cannot have subtracted
they cannot have subtracted	I cannot have been subtracting
you cannot have been subtracting
he cannot have been subtracting
we cannot have been subtracting
you cannot have been subtracting
they cannot have been subtracting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I subtract?
can you subtract?
can he subtract?
can we subtract?
can you subtract?
can they subtract? 	can I be subtracting?
can you be subtracting?
can he be subtracting?
can we be subtracting?
can you be subtracting?
can they be subtracting? 	can I have subtracted?
can you have subtracted?
can he have subtracted?
can we have subtracted?
can you have subtracted?
can they have subtracted? 	can I have been subtracting?
can you have been subtracting?
can he have been subtracting?
can we have been subtracting?
can you have been subtracting?
can they have been subtracting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not subtract?
can you not subtract?
can he not subtract?
can we not subtract?
can you not subtract?
can they not subtract? 	can I not be subtracting?
can you not be subtracting?
can he not be subtracting?
can we not be subtracting?
can you not be subtracting?
can they not be subtracting? 	can I not have subtracted?
can you not have subtracted?
can he not have subtracted?
can we not have subtracted?
can you not have subtracted?
can they not have subtracted? 	can I not have been subtracting?
can you not have been subtracting?
can he not have been subtracting?
can we not have been subtracting?
can you not have been subtracting?
can they not have been subtracting?