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