English verb conjugation
COULD SOUR

Regular verb: sour - soured - soured

Affirmation

Simple form	V-ing form
I could sour you could sour he could sour we could sour you could sour they could sour	I could be souring you could be souring he could be souring we could be souring you could be souring they could be souring
Perfect	V-ing perfect
I could have soured you could have soured he could have soured we could have soured you could have soured they could have soured	I could have been souring you could have been souring he could have been souring we could have been souring you could have been souring they could have been souring

Negation

Simple form	V-ing form
I couldn't sour you couldn't sour he couldn't sour we couldn't sour you couldn't sour they couldn't sour	I couldn't be souring you couldn't be souring he couldn't be souring we couldn't be souring you couldn't be souring they couldn't be souring
Perfect	V-ing perfect
I couldn't have soured you couldn't have soured he couldn't have soured we couldn't have soured you couldn't have soured they couldn't have soured	I couldn't have been souring you couldn't have been souring he couldn't have been souring we couldn't have been souring you couldn't have been souring they couldn't have been souring

Interrogative form

Simple form	V-ing form
could I sour? could you sour? could he sour? could we sour? could you sour? could they sour?	could I be souring? could you be souring? could he be souring? could we be souring? could you be souring? could they be souring?
Perfect	V-ing perfect
could I have soured? could you have soured? could he have soured? could we have soured? could you have soured? could they have soured?	could I have been souring? could you have been souring? could he have been souring? could we have been souring? could you have been souring? could they have been souring?

Interro-negative form

Simple form	V-ing form
couldn't I sour? couldn't you sour? couldn't he sour? couldn't we sour? couldn't you sour? couldn't they sour?	couldn't I be souring? couldn't you be souring? couldn't he be souring? couldn't we be souring? couldn't you be souring? couldn't they be souring?
Perfect	V-ing perfect
couldn't I have soured? couldn't you have soured? couldn't he have soured? couldn't we have soured? couldn't you have soured? couldn't they have soured?	couldn't I have been souring? couldn't you have been souring? couldn't he have been souring? couldn't we have been souring? couldn't you have been souring? couldn't they have been souring?