I can sin you can sin he can sin we can sin you can sin they can sin
V-ing form
I can be sinning you can be sinning he can be sinning we can be sinning you can be sinning they can be sinning
Perfect
I can have sinned you can have sinned he can have sinned we can have sinned you can have sinned they can have sinned
V-ing perfect
I can have been sinning you can have been sinning he can have been sinning we can have been sinning you can have been sinning they can have been sinning
Negation
Simple form
I can't sin you can't sin he can't sin we can't sin you can't sin they can't sin
V-ing form
I can't be sinning you can't be sinning he can't be sinning we can't be sinning you can't be sinning they can't be sinning
Perfect
I can't have sinned you can't have sinned he can't have sinned we can't have sinned you can't have sinned they can't have sinned
V-ing perfect
I can't have been sinning you can't have been sinning he can't have been sinning we can't have been sinning you can't have been sinning they can't have been sinning
Interrogative form
Simple form
can I sin? can you sin? can he sin? can we sin? can you sin? can they sin?
V-ing form
can I be sinning? can you be sinning? can he be sinning? can we be sinning? can you be sinning? can they be sinning?
Perfect
can I have sinned? can you have sinned? can he have sinned? can we have sinned? can you have sinned? can they have sinned?
V-ing perfect
can I have been sinning? can you have been sinning? can he have been sinning? can we have been sinning? can you have been sinning? can they have been sinning?
Interro-negative form
Simple form
can't I sin? can't you sin? can't he sin? can't we sin? can't you sin? can't they sin?
V-ing form
can't I be sinning? can't you be sinning? can't he be sinning? can't we be sinning? can't you be sinning? can't they be sinning?
Perfect
can't I have sinned? can't you have sinned? can't he have sinned? can't we have sinned? can't you have sinned? can't they have sinned?
V-ing perfect
can't I have been sinning? can't you have been sinning? can't he have been sinning? can't we have been sinning? can't you have been sinning? can't they have been sinning?