English verb conjugation
COULD STY

Regular verb: sty - stied - stied

Affirmation

Simple form	V-ing form
I could sty you could sty he could sty we could sty you could sty they could sty	I could be stying you could be stying he could be stying we could be stying you could be stying they could be stying
Perfect	V-ing perfect
I could have stied you could have stied he could have stied we could have stied you could have stied they could have stied	I could have been stying you could have been stying he could have been stying we could have been stying you could have been stying they could have been stying

Negation

Simple form	V-ing form
I could not sty you could not sty he could not sty we could not sty you could not sty they could not sty	I could not be stying you could not be stying he could not be stying we could not be stying you could not be stying they could not be stying
Perfect	V-ing perfect
I could not have stied you could not have stied he could not have stied we could not have stied you could not have stied they could not have stied	I could not have been stying you could not have been stying he could not have been stying we could not have been stying you could not have been stying they could not have been stying

Interrogative form

Simple form	V-ing form
could I sty? could you sty? could he sty? could we sty? could you sty? could they sty?	could I be stying? could you be stying? could he be stying? could we be stying? could you be stying? could they be stying?
Perfect	V-ing perfect
could I have stied? could you have stied? could he have stied? could we have stied? could you have stied? could they have stied?	could I have been stying? could you have been stying? could he have been stying? could we have been stying? could you have been stying? could they have been stying?

Interro-negative form

Simple form	V-ing form
could I not sty? could you not sty? could he not sty? could we not sty? could you not sty? could they not sty?	could I not be stying? could you not be stying? could he not be stying? could we not be stying? could you not be stying? could they not be stying?
Perfect	V-ing perfect
could I not have stied? could you not have stied? could he not have stied? could we not have stied? could you not have stied? could they not have stied?	could I not have been stying? could you not have been stying? could he not have been stying? could we not have been stying? could you not have been stying? could they not have been stying?