English verb conjugation
COULD CONTACT

Regular verb: contact - contacted - contacted

Affirmation

Simple form	V-ing form
I could contact you could contact he could contact we could contact you could contact they could contact	I could be contacting you could be contacting he could be contacting we could be contacting you could be contacting they could be contacting
Perfect	V-ing perfect
I could have contacted you could have contacted he could have contacted we could have contacted you could have contacted they could have contacted	I could have been contacting you could have been contacting he could have been contacting we could have been contacting you could have been contacting they could have been contacting

Negation

Simple form	V-ing form
I could not contact you could not contact he could not contact we could not contact you could not contact they could not contact	I could not be contacting you could not be contacting he could not be contacting we could not be contacting you could not be contacting they could not be contacting
Perfect	V-ing perfect
I could not have contacted you could not have contacted he could not have contacted we could not have contacted you could not have contacted they could not have contacted	I could not have been contacting you could not have been contacting he could not have been contacting we could not have been contacting you could not have been contacting they could not have been contacting

Interrogative form

Simple form	V-ing form
could I contact? could you contact? could he contact? could we contact? could you contact? could they contact?	could I be contacting? could you be contacting? could he be contacting? could we be contacting? could you be contacting? could they be contacting?
Perfect	V-ing perfect
could I have contacted? could you have contacted? could he have contacted? could we have contacted? could you have contacted? could they have contacted?	could I have been contacting? could you have been contacting? could he have been contacting? could we have been contacting? could you have been contacting? could they have been contacting?

Interro-negative form

Simple form	V-ing form
could I not contact? could you not contact? could he not contact? could we not contact? could you not contact? could they not contact?	could I not be contacting? could you not be contacting? could he not be contacting? could we not be contacting? could you not be contacting? could they not be contacting?
Perfect	V-ing perfect
could I not have contacted? could you not have contacted? could he not have contacted? could we not have contacted? could you not have contacted? could they not have contacted?	could I not have been contacting? could you not have been contacting? could he not have been contacting? could we not have been contacting? could you not have been contacting? could they not have been contacting?