I could preach you could preach she could preach we could preach you could preach they could preach
V-ing form
I could be preaching you could be preaching she could be preaching we could be preaching you could be preaching they could be preaching
Perfect
I could have preached you could have preached she could have preached we could have preached you could have preached they could have preached
V-ing perfect
I could have been preaching you could have been preaching she could have been preaching we could have been preaching you could have been preaching they could have been preaching
Negation
Simple form
I couldn't preach you couldn't preach she couldn't preach we couldn't preach you couldn't preach they couldn't preach
V-ing form
I couldn't be preaching you couldn't be preaching she couldn't be preaching we couldn't be preaching you couldn't be preaching they couldn't be preaching
Perfect
I couldn't have preached you couldn't have preached she couldn't have preached we couldn't have preached you couldn't have preached they couldn't have preached
V-ing perfect
I couldn't have been preaching you couldn't have been preaching she couldn't have been preaching we couldn't have been preaching you couldn't have been preaching they couldn't have been preaching
Interrogative form
Simple form
could I preach? could you preach? could she preach? could we preach? could you preach? could they preach?
V-ing form
could I be preaching? could you be preaching? could she be preaching? could we be preaching? could you be preaching? could they be preaching?
Perfect
could I have preached? could you have preached? could she have preached? could we have preached? could you have preached? could they have preached?
V-ing perfect
could I have been preaching? could you have been preaching? could she have been preaching? could we have been preaching? could you have been preaching? could they have been preaching?
Interro-negative form
Simple form
couldn't I preach? couldn't you preach? couldn't she preach? couldn't we preach? couldn't you preach? couldn't they preach?
V-ing form
couldn't I be preaching? couldn't you be preaching? couldn't she be preaching? couldn't we be preaching? couldn't you be preaching? couldn't they be preaching?
Perfect
couldn't I have preached? couldn't you have preached? couldn't she have preached? couldn't we have preached? couldn't you have preached? couldn't they have preached?
V-ing perfect
couldn't I have been preaching? couldn't you have been preaching? couldn't she have been preaching? couldn't we have been preaching? couldn't you have been preaching? couldn't they have been preaching?