English verb conjugation
COULD ROT

Regular verb: rot - rotted - rotted

Affirmation

Simple form	V-ing form
I could rot you could rot he could rot we could rot you could rot they could rot	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	V-ing 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	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	V-ing form
I couldn't rot you couldn't rot he couldn't rot we couldn't rot you couldn't rot they couldn't rot	I couldn't be rotting you couldn't be rotting he couldn't be rotting we couldn't be rotting you couldn't be rotting they couldn't be rotting
Perfect	V-ing perfect
I couldn't have rotted you couldn't have rotted he couldn't have rotted we couldn't have rotted you couldn't have rotted they couldn't have rotted	I couldn't have been rotting you couldn't have been rotting he couldn't have been rotting we couldn't have been rotting you couldn't have been rotting they couldn't have been rotting

Interrogative form

Simple form	V-ing form
could I rot? could you rot? could he rot? could we rot? could you rot? could they rot?	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	V-ing 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?	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	V-ing form
couldn't I rot? couldn't you rot? couldn't he rot? couldn't we rot? couldn't you rot? couldn't they rot?	couldn't I be rotting? couldn't you be rotting? couldn't he be rotting? couldn't we be rotting? couldn't you be rotting? couldn't they be rotting?
Perfect	V-ing perfect
couldn't I have rotted? couldn't you have rotted? couldn't he have rotted? couldn't we have rotted? couldn't you have rotted? couldn't they have rotted?	couldn't I have been rotting? couldn't you have been rotting? couldn't he have been rotting? couldn't we have been rotting? couldn't you have been rotting? couldn't they have been rotting?