English verb conjugation
COULD INTERLINE

Regular verb: interline - interlined - interlined

Affirmation

Simple form	V-ing form
I could interline you could interline he could interline we could interline you could interline they could interline	I could be interlining you could be interlining he could be interlining we could be interlining you could be interlining they could be interlining
Perfect	V-ing perfect
I could have interlined you could have interlined he could have interlined we could have interlined you could have interlined they could have interlined	I could have been interlining you could have been interlining he could have been interlining we could have been interlining you could have been interlining they could have been interlining

Negation

Simple form	V-ing form
I couldn't interline you couldn't interline he couldn't interline we couldn't interline you couldn't interline they couldn't interline	I couldn't be interlining you couldn't be interlining he couldn't be interlining we couldn't be interlining you couldn't be interlining they couldn't be interlining
Perfect	V-ing perfect
I couldn't have interlined you couldn't have interlined he couldn't have interlined we couldn't have interlined you couldn't have interlined they couldn't have interlined	I couldn't have been interlining you couldn't have been interlining he couldn't have been interlining we couldn't have been interlining you couldn't have been interlining they couldn't have been interlining

Interrogative form

Simple form	V-ing form
could I interline? could you interline? could he interline? could we interline? could you interline? could they interline?	could I be interlining? could you be interlining? could he be interlining? could we be interlining? could you be interlining? could they be interlining?
Perfect	V-ing perfect
could I have interlined? could you have interlined? could he have interlined? could we have interlined? could you have interlined? could they have interlined?	could I have been interlining? could you have been interlining? could he have been interlining? could we have been interlining? could you have been interlining? could they have been interlining?

Interro-negative form

Simple form	V-ing form
couldn't I interline? couldn't you interline? couldn't he interline? couldn't we interline? couldn't you interline? couldn't they interline?	couldn't I be interlining? couldn't you be interlining? couldn't he be interlining? couldn't we be interlining? couldn't you be interlining? couldn't they be interlining?
Perfect	V-ing perfect
couldn't I have interlined? couldn't you have interlined? couldn't he have interlined? couldn't we have interlined? couldn't you have interlined? couldn't they have interlined?	couldn't I have been interlining? couldn't you have been interlining? couldn't he have been interlining? couldn't we have been interlining? couldn't you have been interlining? couldn't they have been interlining?