I can preach you can preach he can preach we can preach you can preach they can preach
V-ing form
I can be preaching you can be preaching he can be preaching we can be preaching you can be preaching they can be preaching
Perfect
I can have preached you can have preached he can have preached we can have preached you can have preached they can have preached
V-ing perfect
I can have been preaching you can have been preaching he can have been preaching we can have been preaching you can have been preaching they can have been preaching
Negation
Simple form
I cannot preach you cannot preach he cannot preach we cannot preach you cannot preach they cannot preach
V-ing form
I cannot be preaching you cannot be preaching he cannot be preaching we cannot be preaching you cannot be preaching they cannot be preaching
Perfect
I cannot have preached you cannot have preached he cannot have preached we cannot have preached you cannot have preached they cannot have preached
V-ing perfect
I cannot have been preaching you cannot have been preaching he cannot have been preaching we cannot have been preaching you cannot have been preaching they cannot have been preaching
Interrogative form
Simple form
can I preach? can you preach? can he preach? can we preach? can you preach? can they preach?
V-ing form
can I be preaching? can you be preaching? can he be preaching? can we be preaching? can you be preaching? can they be preaching?
Perfect
can I have preached? can you have preached? can he have preached? can we have preached? can you have preached? can they have preached?
V-ing perfect
can I have been preaching? can you have been preaching? can he have been preaching? can we have been preaching? can you have been preaching? can they have been preaching?
Interro-negative form
Simple form
can I not preach? can you not preach? can he not preach? can we not preach? can you not preach? can they not preach?
V-ing form
can I not be preaching? can you not be preaching? can he not be preaching? can we not be preaching? can you not be preaching? can they not be preaching?
Perfect
can I not have preached? can you not have preached? can he not have preached? can we not have preached? can you not have preached? can they not have preached?
V-ing perfect
can I not have been preaching? can you not have been preaching? can he not have been preaching? can we not have been preaching? can you not have been preaching? can they not have been preaching?