English verb conjugation
COULD WHILE

Regular verb: while - whiled - whiled

Affirmation

Simple form	V-ing form
I could while you could while he could while we could while you could while they could while	I could be whiling you could be whiling he could be whiling we could be whiling you could be whiling they could be whiling
Perfect	V-ing perfect
I could have whiled you could have whiled he could have whiled we could have whiled you could have whiled they could have whiled	I could have been whiling you could have been whiling he could have been whiling we could have been whiling you could have been whiling they could have been whiling

Negation

Simple form	V-ing form
I couldn't while you couldn't while he couldn't while we couldn't while you couldn't while they couldn't while	I couldn't be whiling you couldn't be whiling he couldn't be whiling we couldn't be whiling you couldn't be whiling they couldn't be whiling
Perfect	V-ing perfect
I couldn't have whiled you couldn't have whiled he couldn't have whiled we couldn't have whiled you couldn't have whiled they couldn't have whiled	I couldn't have been whiling you couldn't have been whiling he couldn't have been whiling we couldn't have been whiling you couldn't have been whiling they couldn't have been whiling

Interrogative form

Simple form	V-ing form
could I while? could you while? could he while? could we while? could you while? could they while?	could I be whiling? could you be whiling? could he be whiling? could we be whiling? could you be whiling? could they be whiling?
Perfect	V-ing perfect
could I have whiled? could you have whiled? could he have whiled? could we have whiled? could you have whiled? could they have whiled?	could I have been whiling? could you have been whiling? could he have been whiling? could we have been whiling? could you have been whiling? could they have been whiling?

Interro-negative form

Simple form	V-ing form
couldn't I while? couldn't you while? couldn't he while? couldn't we while? couldn't you while? couldn't they while?	couldn't I be whiling? couldn't you be whiling? couldn't he be whiling? couldn't we be whiling? couldn't you be whiling? couldn't they be whiling?
Perfect	V-ing perfect
couldn't I have whiled? couldn't you have whiled? couldn't he have whiled? couldn't we have whiled? couldn't you have whiled? couldn't they have whiled?	couldn't I have been whiling? couldn't you have been whiling? couldn't he have been whiling? couldn't we have been whiling? couldn't you have been whiling? couldn't they have been whiling?