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 couldn't contact you couldn't contact he couldn't contact we couldn't contact you couldn't contact they couldn't contact	I couldn't be contacting you couldn't be contacting he couldn't be contacting we couldn't be contacting you couldn't be contacting they couldn't be contacting
Perfect	V-ing perfect
I couldn't have contacted you couldn't have contacted he couldn't have contacted we couldn't have contacted you couldn't have contacted they couldn't have contacted	I couldn't have been contacting you couldn't have been contacting he couldn't have been contacting we couldn't have been contacting you couldn't have been contacting they couldn't 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
couldn't I contact? couldn't you contact? couldn't he contact? couldn't we contact? couldn't you contact? couldn't they contact?	couldn't I be contacting? couldn't you be contacting? couldn't he be contacting? couldn't we be contacting? couldn't you be contacting? couldn't they be contacting?
Perfect	V-ing perfect
couldn't I have contacted? couldn't you have contacted? couldn't he have contacted? couldn't we have contacted? couldn't you have contacted? couldn't they have contacted?	couldn't I have been contacting? couldn't you have been contacting? couldn't he have been contacting? couldn't we have been contacting? couldn't you have been contacting? couldn't they have been contacting?