English verb conjugation
COULD SINGLE

Regular verb: single - singled - singled

Affirmation

Simple form	V-ing form
I could single you could single he could single we could single you could single they could single	I could be singling you could be singling he could be singling we could be singling you could be singling they could be singling
Perfect	V-ing perfect
I could have singled you could have singled he could have singled we could have singled you could have singled they could have singled	I could have been singling you could have been singling he could have been singling we could have been singling you could have been singling they could have been singling

Negation

Simple form	V-ing form
I could not single you could not single he could not single we could not single you could not single they could not single	I could not be singling you could not be singling he could not be singling we could not be singling you could not be singling they could not be singling
Perfect	V-ing perfect
I could not have singled you could not have singled he could not have singled we could not have singled you could not have singled they could not have singled	I could not have been singling you could not have been singling he could not have been singling we could not have been singling you could not have been singling they could not have been singling

Interrogative form

Simple form	V-ing form
could I single? could you single? could he single? could we single? could you single? could they single?	could I be singling? could you be singling? could he be singling? could we be singling? could you be singling? could they be singling?
Perfect	V-ing perfect
could I have singled? could you have singled? could he have singled? could we have singled? could you have singled? could they have singled?	could I have been singling? could you have been singling? could he have been singling? could we have been singling? could you have been singling? could they have been singling?

Interro-negative form

Simple form	V-ing form
could I not single? could you not single? could he not single? could we not single? could you not single? could they not single?	could I not be singling? could you not be singling? could he not be singling? could we not be singling? could you not be singling? could they not be singling?
Perfect	V-ing perfect
could I not have singled? could you not have singled? could he not have singled? could we not have singled? could you not have singled? could they not have singled?	could I not have been singling? could you not have been singling? could he not have been singling? could we not have been singling? could you not have been singling? could they not have been singling?