I could aggress you could aggress he could aggress we could aggress you could aggress they could aggress
V-ing form
I could be aggressing you could be aggressing he could be aggressing we could be aggressing you could be aggressing they could be aggressing
Perfect
I could have aggressed you could have aggressed he could have aggressed we could have aggressed you could have aggressed they could have aggressed
V-ing perfect
I could have been aggressing you could have been aggressing he could have been aggressing we could have been aggressing you could have been aggressing they could have been aggressing
Negation
Simple form
I couldn't aggress you couldn't aggress he couldn't aggress we couldn't aggress you couldn't aggress they couldn't aggress
V-ing form
I couldn't be aggressing you couldn't be aggressing he couldn't be aggressing we couldn't be aggressing you couldn't be aggressing they couldn't be aggressing
Perfect
I couldn't have aggressed you couldn't have aggressed he couldn't have aggressed we couldn't have aggressed you couldn't have aggressed they couldn't have aggressed
V-ing perfect
I couldn't have been aggressing you couldn't have been aggressing he couldn't have been aggressing we couldn't have been aggressing you couldn't have been aggressing they couldn't have been aggressing
Interrogative form
Simple form
could I aggress? could you aggress? could he aggress? could we aggress? could you aggress? could they aggress?
V-ing form
could I be aggressing? could you be aggressing? could he be aggressing? could we be aggressing? could you be aggressing? could they be aggressing?
Perfect
could I have aggressed? could you have aggressed? could he have aggressed? could we have aggressed? could you have aggressed? could they have aggressed?
V-ing perfect
could I have been aggressing? could you have been aggressing? could he have been aggressing? could we have been aggressing? could you have been aggressing? could they have been aggressing?
Interro-negative form
Simple form
couldn't I aggress? couldn't you aggress? couldn't he aggress? couldn't we aggress? couldn't you aggress? couldn't they aggress?
V-ing form
couldn't I be aggressing? couldn't you be aggressing? couldn't he be aggressing? couldn't we be aggressing? couldn't you be aggressing? couldn't they be aggressing?
Perfect
couldn't I have aggressed? couldn't you have aggressed? couldn't he have aggressed? couldn't we have aggressed? couldn't you have aggressed? couldn't they have aggressed?
V-ing perfect
couldn't I have been aggressing? couldn't you have been aggressing? couldn't he have been aggressing? couldn't we have been aggressing? couldn't you have been aggressing? couldn't they have been aggressing?