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 couldn't carbonise you couldn't carbonise he couldn't carbonise we couldn't carbonise you couldn't carbonise they couldn't carbonise
V-ing form
I couldn't be carbonising you couldn't be carbonising he couldn't be carbonising we couldn't be carbonising you couldn't be carbonising they couldn't be carbonising
Perfect
I couldn't have carbonised you couldn't have carbonised he couldn't have carbonised we couldn't have carbonised you couldn't have carbonised they couldn't have carbonised
V-ing perfect
I couldn't have been carbonising you couldn't have been carbonising he couldn't have been carbonising we couldn't have been carbonising you couldn't have been carbonising they couldn't 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
couldn't I carbonise? couldn't you carbonise? couldn't he carbonise? couldn't we carbonise? couldn't you carbonise? couldn't they carbonise?
V-ing form
couldn't I be carbonising? couldn't you be carbonising? couldn't he be carbonising? couldn't we be carbonising? couldn't you be carbonising? couldn't they be carbonising?
Perfect
couldn't I have carbonised? couldn't you have carbonised? couldn't he have carbonised? couldn't we have carbonised? couldn't you have carbonised? couldn't they have carbonised?
V-ing perfect
couldn't I have been carbonising? couldn't you have been carbonising? couldn't he have been carbonising? couldn't we have been carbonising? couldn't you have been carbonising? couldn't they have been carbonising?