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 couldn't overboil you couldn't overboil he couldn't overboil we couldn't overboil you couldn't overboil they couldn't overboil	I couldn't be overboiling you couldn't be overboiling he couldn't be overboiling we couldn't be overboiling you couldn't be overboiling they couldn't be overboiling
Perfect	V-ing perfect
I couldn't have overboiled you couldn't have overboiled he couldn't have overboiled we couldn't have overboiled you couldn't have overboiled they couldn't have overboiled	I couldn't have been overboiling you couldn't have been overboiling he couldn't have been overboiling we couldn't have been overboiling you couldn't have been overboiling they couldn't 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
couldn't I overboil? couldn't you overboil? couldn't he overboil? couldn't we overboil? couldn't you overboil? couldn't they overboil?	couldn't I be overboiling? couldn't you be overboiling? couldn't he be overboiling? couldn't we be overboiling? couldn't you be overboiling? couldn't they be overboiling?
Perfect	V-ing perfect
couldn't I have overboiled? couldn't you have overboiled? couldn't he have overboiled? couldn't we have overboiled? couldn't you have overboiled? couldn't they have overboiled?	couldn't I have been overboiling? couldn't you have been overboiling? couldn't he have been overboiling? couldn't we have been overboiling? couldn't you have been overboiling? couldn't they have been overboiling?