English verb conjugation
COULD OIL

Regular verb: oil - oiled - oiled

Affirmation

Simple form	V-ing form
I could oil you could oil he could oil we could oil you could oil they could oil	I could be oiling you could be oiling he could be oiling we could be oiling you could be oiling they could be oiling
Perfect	V-ing perfect
I could have oiled you could have oiled he could have oiled we could have oiled you could have oiled they could have oiled	I could have been oiling you could have been oiling he could have been oiling we could have been oiling you could have been oiling they could have been oiling

Negation

Simple form	V-ing form
I couldn't oil you couldn't oil he couldn't oil we couldn't oil you couldn't oil they couldn't oil	I couldn't be oiling you couldn't be oiling he couldn't be oiling we couldn't be oiling you couldn't be oiling they couldn't be oiling
Perfect	V-ing perfect
I couldn't have oiled you couldn't have oiled he couldn't have oiled we couldn't have oiled you couldn't have oiled they couldn't have oiled	I couldn't have been oiling you couldn't have been oiling he couldn't have been oiling we couldn't have been oiling you couldn't have been oiling they couldn't have been oiling

Interrogative form

Simple form	V-ing form
could I oil? could you oil? could he oil? could we oil? could you oil? could they oil?	could I be oiling? could you be oiling? could he be oiling? could we be oiling? could you be oiling? could they be oiling?
Perfect	V-ing perfect
could I have oiled? could you have oiled? could he have oiled? could we have oiled? could you have oiled? could they have oiled?	could I have been oiling? could you have been oiling? could he have been oiling? could we have been oiling? could you have been oiling? could they have been oiling?

Interro-negative form

Simple form	V-ing form
couldn't I oil? couldn't you oil? couldn't he oil? couldn't we oil? couldn't you oil? couldn't they oil?	couldn't I be oiling? couldn't you be oiling? couldn't he be oiling? couldn't we be oiling? couldn't you be oiling? couldn't they be oiling?
Perfect	V-ing perfect
couldn't I have oiled? couldn't you have oiled? couldn't he have oiled? couldn't we have oiled? couldn't you have oiled? couldn't they have oiled?	couldn't I have been oiling? couldn't you have been oiling? couldn't he have been oiling? couldn't we have been oiling? couldn't you have been oiling? couldn't they have been oiling?