English verb conjugation
COULD SIN

Regular verb: sin - sinned - sinned

Affirmation

Simple form	V-ing form
I could sin you could sin he could sin we could sin you could sin they could sin	I could be sinning you could be sinning he could be sinning we could be sinning you could be sinning they could be sinning
Perfect	V-ing perfect
I could have sinned you could have sinned he could have sinned we could have sinned you could have sinned they could have sinned	I could have been sinning you could have been sinning he could have been sinning we could have been sinning you could have been sinning they could have been sinning

Negation

Simple form	V-ing form
I could not sin you could not sin he could not sin we could not sin you could not sin they could not sin	I could not be sinning you could not be sinning he could not be sinning we could not be sinning you could not be sinning they could not be sinning
Perfect	V-ing perfect
I could not have sinned you could not have sinned he could not have sinned we could not have sinned you could not have sinned they could not have sinned	I could not have been sinning you could not have been sinning he could not have been sinning we could not have been sinning you could not have been sinning they could not have been sinning

Interrogative form

Simple form	V-ing form
could I sin? could you sin? could he sin? could we sin? could you sin? could they sin?	could I be sinning? could you be sinning? could he be sinning? could we be sinning? could you be sinning? could they be sinning?
Perfect	V-ing perfect
could I have sinned? could you have sinned? could he have sinned? could we have sinned? could you have sinned? could they have sinned?	could I have been sinning? could you have been sinning? could he have been sinning? could we have been sinning? could you have been sinning? could they have been sinning?

Interro-negative form

Simple form	V-ing form
could I not sin? could you not sin? could he not sin? could we not sin? could you not sin? could they not sin?	could I not be sinning? could you not be sinning? could he not be sinning? could we not be sinning? could you not be sinning? could they not be sinning?
Perfect	V-ing perfect
could I not have sinned? could you not have sinned? could he not have sinned? could we not have sinned? could you not have sinned? could they not have sinned?	could I not have been sinning? could you not have been sinning? could he not have been sinning? could we not have been sinning? could you not have been sinning? could they not have been sinning?