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 can't preach you can't preach he can't preach we can't preach you can't preach they can't preach
V-ing form
I can't be preaching you can't be preaching he can't be preaching we can't be preaching you can't be preaching they can't be preaching
Perfect
I can't have preached you can't have preached he can't have preached we can't have preached you can't have preached they can't have preached
V-ing perfect
I can't have been preaching you can't have been preaching he can't have been preaching we can't have been preaching you can't have been preaching they can't 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't I preach? can't you preach? can't he preach? can't we preach? can't you preach? can't they preach?
V-ing form
can't I be preaching? can't you be preaching? can't he be preaching? can't we be preaching? can't you be preaching? can't they be preaching?
Perfect
can't I have preached? can't you have preached? can't he have preached? can't we have preached? can't you have preached? can't they have preached?
V-ing perfect
can't I have been preaching? can't you have been preaching? can't he have been preaching? can't we have been preaching? can't you have been preaching? can't they have been preaching?