Regular verb: exist - existed - existed
Simple form | V-ing form |
I could exist you could exist he could exist we could exist you could exist they could exist | I could be existing you could be existing he could be existing we could be existing you could be existing they could be existing |
Perfect | V-ing perfect |
I could have existed you could have existed he could have existed we could have existed you could have existed they could have existed | I could have been existing you could have been existing he could have been existing we could have been existing you could have been existing they could have been existing |
Simple form | V-ing form |
I couldn't exist you couldn't exist he couldn't exist we couldn't exist you couldn't exist they couldn't exist | I couldn't be existing you couldn't be existing he couldn't be existing we couldn't be existing you couldn't be existing they couldn't be existing |
Perfect | V-ing perfect |
I couldn't have existed you couldn't have existed he couldn't have existed we couldn't have existed you couldn't have existed they couldn't have existed | I couldn't have been existing you couldn't have been existing he couldn't have been existing we couldn't have been existing you couldn't have been existing they couldn't have been existing |
Simple form | V-ing form |
could I exist? could you exist? could he exist? could we exist? could you exist? could they exist? | could I be existing? could you be existing? could he be existing? could we be existing? could you be existing? could they be existing? |
Perfect | V-ing perfect |
could I have existed? could you have existed? could he have existed? could we have existed? could you have existed? could they have existed? | could I have been existing? could you have been existing? could he have been existing? could we have been existing? could you have been existing? could they have been existing? |
Simple form | V-ing form |
couldn't I exist? couldn't you exist? couldn't he exist? couldn't we exist? couldn't you exist? couldn't they exist? | couldn't I be existing? couldn't you be existing? couldn't he be existing? couldn't we be existing? couldn't you be existing? couldn't they be existing? |
Perfect | V-ing perfect |
couldn't I have existed? couldn't you have existed? couldn't he have existed? couldn't we have existed? couldn't you have existed? couldn't they have existed? | couldn't I have been existing? couldn't you have been existing? couldn't he have been existing? couldn't we have been existing? couldn't you have been existing? couldn't they have been existing? |