I could communicate you could communicate he could communicate we could communicate you could communicate they could communicate
V-ing form
I could be communicating you could be communicating he could be communicating we could be communicating you could be communicating they could be communicating
Perfect
I could have communicated you could have communicated he could have communicated we could have communicated you could have communicated they could have communicated
V-ing perfect
I could have been communicating you could have been communicating he could have been communicating we could have been communicating you could have been communicating they could have been communicating
Negation
Simple form
I could not communicate you could not communicate he could not communicate we could not communicate you could not communicate they could not communicate
V-ing form
I could not be communicating you could not be communicating he could not be communicating we could not be communicating you could not be communicating they could not be communicating
Perfect
I could not have communicated you could not have communicated he could not have communicated we could not have communicated you could not have communicated they could not have communicated
V-ing perfect
I could not have been communicating you could not have been communicating he could not have been communicating we could not have been communicating you could not have been communicating they could not have been communicating
Interrogative form
Simple form
could I communicate? could you communicate? could he communicate? could we communicate? could you communicate? could they communicate?
V-ing form
could I be communicating? could you be communicating? could he be communicating? could we be communicating? could you be communicating? could they be communicating?
Perfect
could I have communicated? could you have communicated? could he have communicated? could we have communicated? could you have communicated? could they have communicated?
V-ing perfect
could I have been communicating? could you have been communicating? could he have been communicating? could we have been communicating? could you have been communicating? could they have been communicating?
Interro-negative form
Simple form
could I not communicate? could you not communicate? could he not communicate? could we not communicate? could you not communicate? could they not communicate?
V-ing form
could I not be communicating? could you not be communicating? could he not be communicating? could we not be communicating? could you not be communicating? could they not be communicating?
Perfect
could I not have communicated? could you not have communicated? could he not have communicated? could we not have communicated? could you not have communicated? could they not have communicated?
V-ing perfect
could I not have been communicating? could you not have been communicating? could he not have been communicating? could we not have been communicating? could you not have been communicating? could they not have been communicating?