I could carpenter you could carpenter he could carpenter we could carpenter you could carpenter they could carpenter
V-ing form
I could be carpentering you could be carpentering he could be carpentering we could be carpentering you could be carpentering they could be carpentering
Perfect
I could have carpentered you could have carpentered he could have carpentered we could have carpentered you could have carpentered they could have carpentered
V-ing perfect
I could have been carpentering you could have been carpentering he could have been carpentering we could have been carpentering you could have been carpentering they could have been carpentering
Negation
Simple form
I could not carpenter you could not carpenter he could not carpenter we could not carpenter you could not carpenter they could not carpenter
V-ing form
I could not be carpentering you could not be carpentering he could not be carpentering we could not be carpentering you could not be carpentering they could not be carpentering
Perfect
I could not have carpentered you could not have carpentered he could not have carpentered we could not have carpentered you could not have carpentered they could not have carpentered
V-ing perfect
I could not have been carpentering you could not have been carpentering he could not have been carpentering we could not have been carpentering you could not have been carpentering they could not have been carpentering
Interrogative form
Simple form
could I carpenter? could you carpenter? could he carpenter? could we carpenter? could you carpenter? could they carpenter?
V-ing form
could I be carpentering? could you be carpentering? could he be carpentering? could we be carpentering? could you be carpentering? could they be carpentering?
Perfect
could I have carpentered? could you have carpentered? could he have carpentered? could we have carpentered? could you have carpentered? could they have carpentered?
V-ing perfect
could I have been carpentering? could you have been carpentering? could he have been carpentering? could we have been carpentering? could you have been carpentering? could they have been carpentering?
Interro-negative form
Simple form
could I not carpenter? could you not carpenter? could he not carpenter? could we not carpenter? could you not carpenter? could they not carpenter?
V-ing form
could I not be carpentering? could you not be carpentering? could he not be carpentering? could we not be carpentering? could you not be carpentering? could they not be carpentering?
Perfect
could I not have carpentered? could you not have carpentered? could he not have carpentered? could we not have carpentered? could you not have carpentered? could they not have carpentered?
V-ing perfect
could I not have been carpentering? could you not have been carpentering? could he not have been carpentering? could we not have been carpentering? could you not have been carpentering? could they not have been carpentering?