English verb conjugation
COULD SIED

Regular verb: sied - sieded - sieded

Affirmation

Simple form	V-ing form
I could sied you could sied he could sied we could sied you could sied they could sied	I could be sieding you could be sieding he could be sieding we could be sieding you could be sieding they could be sieding
Perfect	V-ing perfect
I could have sieded you could have sieded he could have sieded we could have sieded you could have sieded they could have sieded	I could have been sieding you could have been sieding he could have been sieding we could have been sieding you could have been sieding they could have been sieding

Negation

Simple form	V-ing form
I could not sied you could not sied he could not sied we could not sied you could not sied they could not sied	I could not be sieding you could not be sieding he could not be sieding we could not be sieding you could not be sieding they could not be sieding
Perfect	V-ing perfect
I could not have sieded you could not have sieded he could not have sieded we could not have sieded you could not have sieded they could not have sieded	I could not have been sieding you could not have been sieding he could not have been sieding we could not have been sieding you could not have been sieding they could not have been sieding

Interrogative form

Simple form	V-ing form
could I sied? could you sied? could he sied? could we sied? could you sied? could they sied?	could I be sieding? could you be sieding? could he be sieding? could we be sieding? could you be sieding? could they be sieding?
Perfect	V-ing perfect
could I have sieded? could you have sieded? could he have sieded? could we have sieded? could you have sieded? could they have sieded?	could I have been sieding? could you have been sieding? could he have been sieding? could we have been sieding? could you have been sieding? could they have been sieding?

Interro-negative form

Simple form	V-ing form
could I not sied? could you not sied? could he not sied? could we not sied? could you not sied? could they not sied?	could I not be sieding? could you not be sieding? could he not be sieding? could we not be sieding? could you not be sieding? could they not be sieding?
Perfect	V-ing perfect
could I not have sieded? could you not have sieded? could he not have sieded? could we not have sieded? could you not have sieded? could they not have sieded?	could I not have been sieding? could you not have been sieding? could he not have been sieding? could we not have been sieding? could you not have been sieding? could they not have been sieding?