I can contact you can contact he can contact we can contact you can contact they can contact
V-ing form
I can be contacting you can be contacting he can be contacting we can be contacting you can be contacting they can be contacting
Perfect
I can have contacted you can have contacted he can have contacted we can have contacted you can have contacted they can have contacted
V-ing perfect
I can have been contacting you can have been contacting he can have been contacting we can have been contacting you can have been contacting they can have been contacting
Negation
Simple form
I cannot contact you cannot contact he cannot contact we cannot contact you cannot contact they cannot contact
V-ing form
I cannot be contacting you cannot be contacting he cannot be contacting we cannot be contacting you cannot be contacting they cannot be contacting
Perfect
I cannot have contacted you cannot have contacted he cannot have contacted we cannot have contacted you cannot have contacted they cannot have contacted
V-ing perfect
I cannot have been contacting you cannot have been contacting he cannot have been contacting we cannot have been contacting you cannot have been contacting they cannot have been contacting
Interrogative form
Simple form
can I contact? can you contact? can he contact? can we contact? can you contact? can they contact?
V-ing form
can I be contacting? can you be contacting? can he be contacting? can we be contacting? can you be contacting? can they be contacting?
Perfect
can I have contacted? can you have contacted? can he have contacted? can we have contacted? can you have contacted? can they have contacted?
V-ing perfect
can I have been contacting? can you have been contacting? can he have been contacting? can we have been contacting? can you have been contacting? can they have been contacting?
Interro-negative form
Simple form
can I not contact? can you not contact? can he not contact? can we not contact? can you not contact? can they not contact?
V-ing form
can I not be contacting? can you not be contacting? can he not be contacting? can we not be contacting? can you not be contacting? can they not be contacting?
Perfect
can I not have contacted? can you not have contacted? can he not have contacted? can we not have contacted? can you not have contacted? can they not have contacted?
V-ing perfect
can I not have been contacting? can you not have been contacting? can he not have been contacting? can we not have been contacting? can you not have been contacting? can they not have been contacting?