English verb conjugation
COULD DIFFERENTIATE

Regular verb: differentiate - differentiated - differentiated

Affirmation

Simple form	V-ing form
I could differentiate you could differentiate she could differentiate we could differentiate you could differentiate they could differentiate	I could be differentiating you could be differentiating she could be differentiating we could be differentiating you could be differentiating they could be differentiating
Perfect	V-ing perfect
I could have differentiated you could have differentiated she could have differentiated we could have differentiated you could have differentiated they could have differentiated	I could have been differentiating you could have been differentiating she could have been differentiating we could have been differentiating you could have been differentiating they could have been differentiating

Negation

Simple form	V-ing form
I could not differentiate you could not differentiate she could not differentiate we could not differentiate you could not differentiate they could not differentiate	I could not be differentiating you could not be differentiating she could not be differentiating we could not be differentiating you could not be differentiating they could not be differentiating
Perfect	V-ing perfect
I could not have differentiated you could not have differentiated she could not have differentiated we could not have differentiated you could not have differentiated they could not have differentiated	I could not have been differentiating you could not have been differentiating she could not have been differentiating we could not have been differentiating you could not have been differentiating they could not have been differentiating

Interrogative form

Simple form	V-ing form
could I differentiate? could you differentiate? could she differentiate? could we differentiate? could you differentiate? could they differentiate?	could I be differentiating? could you be differentiating? could she be differentiating? could we be differentiating? could you be differentiating? could they be differentiating?
Perfect	V-ing perfect
could I have differentiated? could you have differentiated? could she have differentiated? could we have differentiated? could you have differentiated? could they have differentiated?	could I have been differentiating? could you have been differentiating? could she have been differentiating? could we have been differentiating? could you have been differentiating? could they have been differentiating?

Interro-negative form

Simple form	V-ing form
could I not differentiate? could you not differentiate? could she not differentiate? could we not differentiate? could you not differentiate? could they not differentiate?	could I not be differentiating? could you not be differentiating? could she not be differentiating? could we not be differentiating? could you not be differentiating? could they not be differentiating?
Perfect	V-ing perfect
could I not have differentiated? could you not have differentiated? could she not have differentiated? could we not have differentiated? could you not have differentiated? could they not have differentiated?	could I not have been differentiating? could you not have been differentiating? could she not have been differentiating? could we not have been differentiating? could you not have been differentiating? could they not have been differentiating?