English verb conjugation
COULD SOIL

Regular verb: soil - soiled - soiled

Affirmation

Simple form	V-ing form
I could soil you could soil he could soil we could soil you could soil they could soil	I could be soiling you could be soiling he could be soiling we could be soiling you could be soiling they could be soiling
Perfect	V-ing perfect
I could have soiled you could have soiled he could have soiled we could have soiled you could have soiled they could have soiled	I could have been soiling you could have been soiling he could have been soiling we could have been soiling you could have been soiling they could have been soiling

Negation

Simple form	V-ing form
I could not soil you could not soil he could not soil we could not soil you could not soil they could not soil	I could not be soiling you could not be soiling he could not be soiling we could not be soiling you could not be soiling they could not be soiling
Perfect	V-ing perfect
I could not have soiled you could not have soiled he could not have soiled we could not have soiled you could not have soiled they could not have soiled	I could not have been soiling you could not have been soiling he could not have been soiling we could not have been soiling you could not have been soiling they could not have been soiling

Interrogative form

Simple form	V-ing form
could I soil? could you soil? could he soil? could we soil? could you soil? could they soil?	could I be soiling? could you be soiling? could he be soiling? could we be soiling? could you be soiling? could they be soiling?
Perfect	V-ing perfect
could I have soiled? could you have soiled? could he have soiled? could we have soiled? could you have soiled? could they have soiled?	could I have been soiling? could you have been soiling? could he have been soiling? could we have been soiling? could you have been soiling? could they have been soiling?

Interro-negative form

Simple form	V-ing form
could I not soil? could you not soil? could he not soil? could we not soil? could you not soil? could they not soil?	could I not be soiling? could you not be soiling? could he not be soiling? could we not be soiling? could you not be soiling? could they not be soiling?
Perfect	V-ing perfect
could I not have soiled? could you not have soiled? could he not have soiled? could we not have soiled? could you not have soiled? could they not have soiled?	could I not have been soiling? could you not have been soiling? could he not have been soiling? could we not have been soiling? could you not have been soiling? could they not have been soiling?