I can sin you can sin she can sin we can sin you can sin they can sin
V-ing form
I can be sinning you can be sinning she can be sinning we can be sinning you can be sinning they can be sinning
Perfect
I can have sinned you can have sinned she 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 she can have been sinning we can have been sinning you can have been sinning they can have been sinning
Negation
Simple form
I cannot sin you cannot sin she cannot sin we cannot sin you cannot sin they cannot sin
V-ing form
I cannot be sinning you cannot be sinning she cannot be sinning we cannot be sinning you cannot be sinning they cannot be sinning
Perfect
I cannot have sinned you cannot have sinned she cannot have sinned we cannot have sinned you cannot have sinned they cannot have sinned
V-ing perfect
I cannot have been sinning you cannot have been sinning she cannot have been sinning we cannot have been sinning you cannot have been sinning they cannot have been sinning
Interrogative form
Simple form
can I sin? can you sin? can she sin? can we sin? can you sin? can they sin?
V-ing form
can I be sinning? can you be sinning? can she be sinning? can we be sinning? can you be sinning? can they be sinning?
Perfect
can I have sinned? can you have sinned? can she 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 she have been sinning? can we have been sinning? can you have been sinning? can they have been sinning?
Interro-negative form
Simple form
can I not sin? can you not sin? can she not sin? can we not sin? can you not sin? can they not sin?
V-ing form
can I not be sinning? can you not be sinning? can she not be sinning? can we not be sinning? can you not be sinning? can they not be sinning?
Perfect
can I not have sinned? can you not have sinned? can she not have sinned? can we not have sinned? can you not have sinned? can they not have sinned?
V-ing perfect
can I not have been sinning? can you not have been sinning? can she not have been sinning? can we not have been sinning? can you not have been sinning? can they not have been sinning?