Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I could forbid sth you could forbid sth he could forbid sth we could forbid sth you could forbid sth they could forbid sth
V-ing form
I could be forbid sthing you could be forbid sthing he could be forbid sthing we could be forbid sthing you could be forbid sthing they could be forbid sthing
Perfect
I could have forbid sthed you could have forbid sthed he could have forbid sthed we could have forbid sthed you could have forbid sthed they could have forbid sthed
V-ing perfect
I could have been forbid sthing you could have been forbid sthing he could have been forbid sthing we could have been forbid sthing you could have been forbid sthing they could have been forbid sthing
Negation
Simple form
I couldn't forbid sth you couldn't forbid sth he couldn't forbid sth we couldn't forbid sth you couldn't forbid sth they couldn't forbid sth
V-ing form
I couldn't be forbid sthing you couldn't be forbid sthing he couldn't be forbid sthing we couldn't be forbid sthing you couldn't be forbid sthing they couldn't be forbid sthing
Perfect
I couldn't have forbid sthed you couldn't have forbid sthed he couldn't have forbid sthed we couldn't have forbid sthed you couldn't have forbid sthed they couldn't have forbid sthed
V-ing perfect
I couldn't have been forbid sthing you couldn't have been forbid sthing he couldn't have been forbid sthing we couldn't have been forbid sthing you couldn't have been forbid sthing they couldn't have been forbid sthing
Interrogative form
Simple form
could I forbid sth? could you forbid sth? could he forbid sth? could we forbid sth? could you forbid sth? could they forbid sth?
V-ing form
could I be forbid sthing? could you be forbid sthing? could he be forbid sthing? could we be forbid sthing? could you be forbid sthing? could they be forbid sthing?
Perfect
could I have forbid sthed? could you have forbid sthed? could he have forbid sthed? could we have forbid sthed? could you have forbid sthed? could they have forbid sthed?
V-ing perfect
could I have been forbid sthing? could you have been forbid sthing? could he have been forbid sthing? could we have been forbid sthing? could you have been forbid sthing? could they have been forbid sthing?
Interro-negative form
Simple form
couldn't I forbid sth? couldn't you forbid sth? couldn't he forbid sth? couldn't we forbid sth? couldn't you forbid sth? couldn't they forbid sth?
V-ing form
couldn't I be forbid sthing? couldn't you be forbid sthing? couldn't he be forbid sthing? couldn't we be forbid sthing? couldn't you be forbid sthing? couldn't they be forbid sthing?
Perfect
couldn't I have forbid sthed? couldn't you have forbid sthed? couldn't he have forbid sthed? couldn't we have forbid sthed? couldn't you have forbid sthed? couldn't they have forbid sthed?
V-ing perfect
couldn't I have been forbid sthing? couldn't you have been forbid sthing? couldn't he have been forbid sthing? couldn't we have been forbid sthing? couldn't you have been forbid sthing? couldn't they have been forbid sthing?