English verb conjugation
COULD INTERPOLATE

Regular verb: interpolate - interpolated - interpolated

Affirmation

Simple form	V-ing form
I could interpolate you could interpolate he could interpolate we could interpolate you could interpolate they could interpolate	I could be interpolating you could be interpolating he could be interpolating we could be interpolating you could be interpolating they could be interpolating
Perfect	V-ing perfect
I could have interpolated you could have interpolated he could have interpolated we could have interpolated you could have interpolated they could have interpolated	I could have been interpolating you could have been interpolating he could have been interpolating we could have been interpolating you could have been interpolating they could have been interpolating

Negation

Simple form	V-ing form
I could not interpolate you could not interpolate he could not interpolate we could not interpolate you could not interpolate they could not interpolate	I could not be interpolating you could not be interpolating he could not be interpolating we could not be interpolating you could not be interpolating they could not be interpolating
Perfect	V-ing perfect
I could not have interpolated you could not have interpolated he could not have interpolated we could not have interpolated you could not have interpolated they could not have interpolated	I could not have been interpolating you could not have been interpolating he could not have been interpolating we could not have been interpolating you could not have been interpolating they could not have been interpolating

Interrogative form

Simple form	V-ing form
could I interpolate? could you interpolate? could he interpolate? could we interpolate? could you interpolate? could they interpolate?	could I be interpolating? could you be interpolating? could he be interpolating? could we be interpolating? could you be interpolating? could they be interpolating?
Perfect	V-ing perfect
could I have interpolated? could you have interpolated? could he have interpolated? could we have interpolated? could you have interpolated? could they have interpolated?	could I have been interpolating? could you have been interpolating? could he have been interpolating? could we have been interpolating? could you have been interpolating? could they have been interpolating?

Interro-negative form

Simple form	V-ing form
could I not interpolate? could you not interpolate? could he not interpolate? could we not interpolate? could you not interpolate? could they not interpolate?	could I not be interpolating? could you not be interpolating? could he not be interpolating? could we not be interpolating? could you not be interpolating? could they not be interpolating?
Perfect	V-ing perfect
could I not have interpolated? could you not have interpolated? could he not have interpolated? could we not have interpolated? could you not have interpolated? could they not have interpolated?	could I not have been interpolating? could you not have been interpolating? could he not have been interpolating? could we not have been interpolating? could you not have been interpolating? could they not have been interpolating?