English verb conjugation
COULD INVADE

Regular verb: invade - invaded - invaded

Affirmation

Simple form	V-ing form
I could invade you could invade he could invade we could invade you could invade they could invade	I could be invading you could be invading he could be invading we could be invading you could be invading they could be invading
Perfect	V-ing perfect
I could have invaded you could have invaded he could have invaded we could have invaded you could have invaded they could have invaded	I could have been invading you could have been invading he could have been invading we could have been invading you could have been invading they could have been invading

Negation

Simple form	V-ing form
I couldn't invade you couldn't invade he couldn't invade we couldn't invade you couldn't invade they couldn't invade	I couldn't be invading you couldn't be invading he couldn't be invading we couldn't be invading you couldn't be invading they couldn't be invading
Perfect	V-ing perfect
I couldn't have invaded you couldn't have invaded he couldn't have invaded we couldn't have invaded you couldn't have invaded they couldn't have invaded	I couldn't have been invading you couldn't have been invading he couldn't have been invading we couldn't have been invading you couldn't have been invading they couldn't have been invading

Interrogative form

Simple form	V-ing form
could I invade? could you invade? could he invade? could we invade? could you invade? could they invade?	could I be invading? could you be invading? could he be invading? could we be invading? could you be invading? could they be invading?
Perfect	V-ing perfect
could I have invaded? could you have invaded? could he have invaded? could we have invaded? could you have invaded? could they have invaded?	could I have been invading? could you have been invading? could he have been invading? could we have been invading? could you have been invading? could they have been invading?

Interro-negative form

Simple form	V-ing form
couldn't I invade? couldn't you invade? couldn't he invade? couldn't we invade? couldn't you invade? couldn't they invade?	couldn't I be invading? couldn't you be invading? couldn't he be invading? couldn't we be invading? couldn't you be invading? couldn't they be invading?
Perfect	V-ing perfect
couldn't I have invaded? couldn't you have invaded? couldn't he have invaded? couldn't we have invaded? couldn't you have invaded? couldn't they have invaded?	couldn't I have been invading? couldn't you have been invading? couldn't he have been invading? couldn't we have been invading? couldn't you have been invading? couldn't they have been invading?