English verb conjugation
COULD PARBOIL

Regular verb: parboil - parboiled - parboiled

Affirmation

Simple form	V-ing form
I could parboil you could parboil he could parboil we could parboil you could parboil they could parboil	I could be parboiling you could be parboiling he could be parboiling we could be parboiling you could be parboiling they could be parboiling
Perfect	V-ing perfect
I could have parboiled you could have parboiled he could have parboiled we could have parboiled you could have parboiled they could have parboiled	I could have been parboiling you could have been parboiling he could have been parboiling we could have been parboiling you could have been parboiling they could have been parboiling

Negation

Simple form	V-ing form
I couldn't parboil you couldn't parboil he couldn't parboil we couldn't parboil you couldn't parboil they couldn't parboil	I couldn't be parboiling you couldn't be parboiling he couldn't be parboiling we couldn't be parboiling you couldn't be parboiling they couldn't be parboiling
Perfect	V-ing perfect
I couldn't have parboiled you couldn't have parboiled he couldn't have parboiled we couldn't have parboiled you couldn't have parboiled they couldn't have parboiled	I couldn't have been parboiling you couldn't have been parboiling he couldn't have been parboiling we couldn't have been parboiling you couldn't have been parboiling they couldn't have been parboiling

Interrogative form

Simple form	V-ing form
could I parboil? could you parboil? could he parboil? could we parboil? could you parboil? could they parboil?	could I be parboiling? could you be parboiling? could he be parboiling? could we be parboiling? could you be parboiling? could they be parboiling?
Perfect	V-ing perfect
could I have parboiled? could you have parboiled? could he have parboiled? could we have parboiled? could you have parboiled? could they have parboiled?	could I have been parboiling? could you have been parboiling? could he have been parboiling? could we have been parboiling? could you have been parboiling? could they have been parboiling?

Interro-negative form

Simple form	V-ing form
couldn't I parboil? couldn't you parboil? couldn't he parboil? couldn't we parboil? couldn't you parboil? couldn't they parboil?	couldn't I be parboiling? couldn't you be parboiling? couldn't he be parboiling? couldn't we be parboiling? couldn't you be parboiling? couldn't they be parboiling?
Perfect	V-ing perfect
couldn't I have parboiled? couldn't you have parboiled? couldn't he have parboiled? couldn't we have parboiled? couldn't you have parboiled? couldn't they have parboiled?	couldn't I have been parboiling? couldn't you have been parboiling? couldn't he have been parboiling? couldn't we have been parboiling? couldn't you have been parboiling? couldn't they have been parboiling?