I could rot you could rot he could rot we could rot you could rot they could rot
V-ing form
I could be rotting you could be rotting he could be rotting we could be rotting you could be rotting they could be rotting
Perfect
I could have rotted you could have rotted he could have rotted we could have rotted you could have rotted they could have rotted
V-ing perfect
I could have been rotting you could have been rotting he could have been rotting we could have been rotting you could have been rotting they could have been rotting
Negation
Simple form
I could not rot you could not rot he could not rot we could not rot you could not rot they could not rot
V-ing form
I could not be rotting you could not be rotting he could not be rotting we could not be rotting you could not be rotting they could not be rotting
Perfect
I could not have rotted you could not have rotted he could not have rotted we could not have rotted you could not have rotted they could not have rotted
V-ing perfect
I could not have been rotting you could not have been rotting he could not have been rotting we could not have been rotting you could not have been rotting they could not have been rotting
Interrogative form
Simple form
could I rot? could you rot? could he rot? could we rot? could you rot? could they rot?
V-ing form
could I be rotting? could you be rotting? could he be rotting? could we be rotting? could you be rotting? could they be rotting?
Perfect
could I have rotted? could you have rotted? could he have rotted? could we have rotted? could you have rotted? could they have rotted?
V-ing perfect
could I have been rotting? could you have been rotting? could he have been rotting? could we have been rotting? could you have been rotting? could they have been rotting?
Interro-negative form
Simple form
could I not rot? could you not rot? could he not rot? could we not rot? could you not rot? could they not rot?
V-ing form
could I not be rotting? could you not be rotting? could he not be rotting? could we not be rotting? could you not be rotting? could they not be rotting?
Perfect
could I not have rotted? could you not have rotted? could he not have rotted? could we not have rotted? could you not have rotted? could they not have rotted?
V-ing perfect
could I not have been rotting? could you not have been rotting? could he not have been rotting? could we not have been rotting? could you not have been rotting? could they not have been rotting?