I can invade you can invade he can invade we can invade you can invade they can invade
V-ing form
I can be invading you can be invading he can be invading we can be invading you can be invading they can be invading
Perfect
I can have invaded you can have invaded he can have invaded we can have invaded you can have invaded they can have invaded
V-ing perfect
I can have been invading you can have been invading he can have been invading we can have been invading you can have been invading they can have been invading
Negation
Simple form
I can't invade you can't invade he can't invade we can't invade you can't invade they can't invade
V-ing form
I can't be invading you can't be invading he can't be invading we can't be invading you can't be invading they can't be invading
Perfect
I can't have invaded you can't have invaded he can't have invaded we can't have invaded you can't have invaded they can't have invaded
V-ing perfect
I can't have been invading you can't have been invading he can't have been invading we can't have been invading you can't have been invading they can't have been invading
Interrogative form
Simple form
can I invade? can you invade? can he invade? can we invade? can you invade? can they invade?
V-ing form
can I be invading? can you be invading? can he be invading? can we be invading? can you be invading? can they be invading?
Perfect
can I have invaded? can you have invaded? can he have invaded? can we have invaded? can you have invaded? can they have invaded?
V-ing perfect
can I have been invading? can you have been invading? can he have been invading? can we have been invading? can you have been invading? can they have been invading?
Interro-negative form
Simple form
can't I invade? can't you invade? can't he invade? can't we invade? can't you invade? can't they invade?
V-ing form
can't I be invading? can't you be invading? can't he be invading? can't we be invading? can't you be invading? can't they be invading?
Perfect
can't I have invaded? can't you have invaded? can't he have invaded? can't we have invaded? can't you have invaded? can't they have invaded?
V-ing perfect
can't I have been invading? can't you have been invading? can't he have been invading? can't we have been invading? can't you have been invading? can't they have been invading?