I could subtract you could subtract she could subtract we could subtract you could subtract they could subtract
Forme en V-ing
I could be subtracting you could be subtracting she could be subtracting we could be subtracting you could be subtracting they could be subtracting
Perfect
I could have subtracted you could have subtracted she could have subtracted we could have subtracted you could have subtracted they could have subtracted
Perfect en V-ing
I could have been subtracting you could have been subtracting she could have been subtracting we could have been subtracting you could have been subtracting they could have been subtracting
Négation
Forme simple
I couldn't subtract you couldn't subtract she couldn't subtract we couldn't subtract you couldn't subtract they couldn't subtract
Forme en V-ing
I couldn't be subtracting you couldn't be subtracting she couldn't be subtracting we couldn't be subtracting you couldn't be subtracting they couldn't be subtracting
Perfect
I couldn't have subtracted you couldn't have subtracted she couldn't have subtracted we couldn't have subtracted you couldn't have subtracted they couldn't have subtracted
Perfect en V-ing
I couldn't have been subtracting you couldn't have been subtracting she couldn't have been subtracting we couldn't have been subtracting you couldn't have been subtracting they couldn't have been subtracting
Forme interrogative
Forme simple
could I subtract? could you subtract? could she subtract? could we subtract? could you subtract? could they subtract?
Forme en V-ing
could I be subtracting? could you be subtracting? could she be subtracting? could we be subtracting? could you be subtracting? could they be subtracting?
Perfect
could I have subtracted? could you have subtracted? could she have subtracted? could we have subtracted? could you have subtracted? could they have subtracted?
Perfect en V-ing
could I have been subtracting? could you have been subtracting? could she have been subtracting? could we have been subtracting? could you have been subtracting? could they have been subtracting?
Forme interro-négative
Forme simple
couldn't I subtract? couldn't you subtract? couldn't she subtract? couldn't we subtract? couldn't you subtract? couldn't they subtract?
Forme en V-ing
couldn't I be subtracting? couldn't you be subtracting? couldn't she be subtracting? couldn't we be subtracting? couldn't you be subtracting? couldn't they be subtracting?
Perfect
couldn't I have subtracted? couldn't you have subtracted? couldn't she have subtracted? couldn't we have subtracted? couldn't you have subtracted? couldn't they have subtracted?
Perfect en V-ing
couldn't I have been subtracting? couldn't you have been subtracting? couldn't she have been subtracting? couldn't we have been subtracting? couldn't you have been subtracting? couldn't they have been subtracting?