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 couldn't sied you couldn't sied he couldn't sied we couldn't sied you couldn't sied they couldn't sied	I couldn't be sieding you couldn't be sieding he couldn't be sieding we couldn't be sieding you couldn't be sieding they couldn't be sieding
Perfect	V-ing perfect
I couldn't have sieded you couldn't have sieded he couldn't have sieded we couldn't have sieded you couldn't have sieded they couldn't have sieded	I couldn't have been sieding you couldn't have been sieding he couldn't have been sieding we couldn't have been sieding you couldn't have been sieding they couldn't 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
couldn't I sied? couldn't you sied? couldn't he sied? couldn't we sied? couldn't you sied? couldn't they sied?	couldn't I be sieding? couldn't you be sieding? couldn't he be sieding? couldn't we be sieding? couldn't you be sieding? couldn't they be sieding?
Perfect	V-ing perfect
couldn't I have sieded? couldn't you have sieded? couldn't he have sieded? couldn't we have sieded? couldn't you have sieded? couldn't they have sieded?	couldn't I have been sieding? couldn't you have been sieding? couldn't he have been sieding? couldn't we have been sieding? couldn't you have been sieding? couldn't they have been sieding?