English verb conjugation
CAN SUBTRACT

Regular verb: subtract - subtracted - subtracted

Affirmation

Simple form	V-ing form
I can subtract you can subtract she can subtract we can subtract you can subtract they can subtract	I can be subtracting you can be subtracting she can be subtracting we can be subtracting you can be subtracting they can be subtracting
Perfect	V-ing perfect
I can have subtracted you can have subtracted she 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 she 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
I can't subtract you can't subtract she can't subtract we can't subtract you can't subtract they can't subtract	I can't be subtracting you can't be subtracting she can't be subtracting we can't be subtracting you can't be subtracting they can't be subtracting
Perfect	V-ing perfect
I can't have subtracted you can't have subtracted she can't have subtracted we can't have subtracted you can't have subtracted they can't have subtracted	I can't have been subtracting you can't have been subtracting she can't have been subtracting we can't have been subtracting you can't have been subtracting they can't have been subtracting

Interrogative form

Simple form	V-ing form
can I subtract? can you subtract? can she subtract? can we subtract? can you subtract? can they subtract?	can I be subtracting? can you be subtracting? can she be subtracting? can we be subtracting? can you be subtracting? can they be subtracting?
Perfect	V-ing perfect
can I have subtracted? can you have subtracted? can she 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 she 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
can't I subtract? can't you subtract? can't she subtract? can't we subtract? can't you subtract? can't they subtract?	can't I be subtracting? can't you be subtracting? can't she be subtracting? can't we be subtracting? can't you be subtracting? can't they be subtracting?
Perfect	V-ing perfect
can't I have subtracted? can't you have subtracted? can't she have subtracted? can't we have subtracted? can't you have subtracted? can't they have subtracted?	can't I have been subtracting? can't you have been subtracting? can't she have been subtracting? can't we have been subtracting? can't you have been subtracting? can't they have been subtracting?