I could carbonise you could carbonise he could carbonise we could carbonise you could carbonise they could carbonise
V-ing form
I could be carbonising you could be carbonising he could be carbonising we could be carbonising you could be carbonising they could be carbonising
Perfect
I could have carbonised you could have carbonised he could have carbonised we could have carbonised you could have carbonised they could have carbonised
V-ing perfect
I could have been carbonising you could have been carbonising he could have been carbonising we could have been carbonising you could have been carbonising they could have been carbonising
Negation
Simple form
I could not carbonise you could not carbonise he could not carbonise we could not carbonise you could not carbonise they could not carbonise
V-ing form
I could not be carbonising you could not be carbonising he could not be carbonising we could not be carbonising you could not be carbonising they could not be carbonising
Perfect
I could not have carbonised you could not have carbonised he could not have carbonised we could not have carbonised you could not have carbonised they could not have carbonised
V-ing perfect
I could not have been carbonising you could not have been carbonising he could not have been carbonising we could not have been carbonising you could not have been carbonising they could not have been carbonising
Interrogative form
Simple form
could I carbonise? could you carbonise? could he carbonise? could we carbonise? could you carbonise? could they carbonise?
V-ing form
could I be carbonising? could you be carbonising? could he be carbonising? could we be carbonising? could you be carbonising? could they be carbonising?
Perfect
could I have carbonised? could you have carbonised? could he have carbonised? could we have carbonised? could you have carbonised? could they have carbonised?
V-ing perfect
could I have been carbonising? could you have been carbonising? could he have been carbonising? could we have been carbonising? could you have been carbonising? could they have been carbonising?
Interro-negative form
Simple form
could I not carbonise? could you not carbonise? could he not carbonise? could we not carbonise? could you not carbonise? could they not carbonise?
V-ing form
could I not be carbonising? could you not be carbonising? could he not be carbonising? could we not be carbonising? could you not be carbonising? could they not be carbonising?
Perfect
could I not have carbonised? could you not have carbonised? could he not have carbonised? could we not have carbonised? could you not have carbonised? could they not have carbonised?
V-ing perfect
could I not have been carbonising? could you not have been carbonising? could he not have been carbonising? could we not have been carbonising? could you not have been carbonising? could they not have been carbonising?