English verb conjugation
COULD COLLABORATE

Regular verb: collaborate - collaborated - collaborated

Affirmation

Simple form	V-ing form
I could collaborate you could collaborate he could collaborate we could collaborate you could collaborate they could collaborate	I could be collaborating you could be collaborating he could be collaborating we could be collaborating you could be collaborating they could be collaborating
Perfect	V-ing perfect
I could have collaborated you could have collaborated he could have collaborated we could have collaborated you could have collaborated they could have collaborated	I could have been collaborating you could have been collaborating he could have been collaborating we could have been collaborating you could have been collaborating they could have been collaborating

Negation

Simple form	V-ing form
I could not collaborate you could not collaborate he could not collaborate we could not collaborate you could not collaborate they could not collaborate	I could not be collaborating you could not be collaborating he could not be collaborating we could not be collaborating you could not be collaborating they could not be collaborating
Perfect	V-ing perfect
I could not have collaborated you could not have collaborated he could not have collaborated we could not have collaborated you could not have collaborated they could not have collaborated	I could not have been collaborating you could not have been collaborating he could not have been collaborating we could not have been collaborating you could not have been collaborating they could not have been collaborating

Interrogative form

Simple form	V-ing form
could I collaborate? could you collaborate? could he collaborate? could we collaborate? could you collaborate? could they collaborate?	could I be collaborating? could you be collaborating? could he be collaborating? could we be collaborating? could you be collaborating? could they be collaborating?
Perfect	V-ing perfect
could I have collaborated? could you have collaborated? could he have collaborated? could we have collaborated? could you have collaborated? could they have collaborated?	could I have been collaborating? could you have been collaborating? could he have been collaborating? could we have been collaborating? could you have been collaborating? could they have been collaborating?

Interro-negative form

Simple form	V-ing form
could I not collaborate? could you not collaborate? could he not collaborate? could we not collaborate? could you not collaborate? could they not collaborate?	could I not be collaborating? could you not be collaborating? could he not be collaborating? could we not be collaborating? could you not be collaborating? could they not be collaborating?
Perfect	V-ing perfect
could I not have collaborated? could you not have collaborated? could he not have collaborated? could we not have collaborated? could you not have collaborated? could they not have collaborated?	could I not have been collaborating? could you not have been collaborating? could he not have been collaborating? could we not have been collaborating? could you not have been collaborating? could they not have been collaborating?