English verb conjugation
COULD OVERBOIL

Regular verb: overboil - overboiled - overboiled

Affirmation

Simple form	V-ing form
I could overboil you could overboil he could overboil we could overboil you could overboil they could overboil	I could be overboiling you could be overboiling he could be overboiling we could be overboiling you could be overboiling they could be overboiling
Perfect	V-ing perfect
I could have overboiled you could have overboiled he could have overboiled we could have overboiled you could have overboiled they could have overboiled	I could have been overboiling you could have been overboiling he could have been overboiling we could have been overboiling you could have been overboiling they could have been overboiling

Negation

Simple form	V-ing form
I could not overboil you could not overboil he could not overboil we could not overboil you could not overboil they could not overboil	I could not be overboiling you could not be overboiling he could not be overboiling we could not be overboiling you could not be overboiling they could not be overboiling
Perfect	V-ing perfect
I could not have overboiled you could not have overboiled he could not have overboiled we could not have overboiled you could not have overboiled they could not have overboiled	I could not have been overboiling you could not have been overboiling he could not have been overboiling we could not have been overboiling you could not have been overboiling they could not have been overboiling

Interrogative form

Simple form	V-ing form
could I overboil? could you overboil? could he overboil? could we overboil? could you overboil? could they overboil?	could I be overboiling? could you be overboiling? could he be overboiling? could we be overboiling? could you be overboiling? could they be overboiling?
Perfect	V-ing perfect
could I have overboiled? could you have overboiled? could he have overboiled? could we have overboiled? could you have overboiled? could they have overboiled?	could I have been overboiling? could you have been overboiling? could he have been overboiling? could we have been overboiling? could you have been overboiling? could they have been overboiling?

Interro-negative form

Simple form	V-ing form
could I not overboil? could you not overboil? could he not overboil? could we not overboil? could you not overboil? could they not overboil?	could I not be overboiling? could you not be overboiling? could he not be overboiling? could we not be overboiling? could you not be overboiling? could they not be overboiling?
Perfect	V-ing perfect
could I not have overboiled? could you not have overboiled? could he not have overboiled? could we not have overboiled? could you not have overboiled? could they not have overboiled?	could I not have been overboiling? could you not have been overboiling? could he not have been overboiling? could we not have been overboiling? could you not have been overboiling? could they not have been overboiling?