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 couldn't communicate you couldn't communicate he couldn't communicate we couldn't communicate you couldn't communicate they couldn't communicate
V-ing form
I couldn't be communicating you couldn't be communicating he couldn't be communicating we couldn't be communicating you couldn't be communicating they couldn't be communicating
Perfect
I couldn't have communicated you couldn't have communicated he couldn't have communicated we couldn't have communicated you couldn't have communicated they couldn't have communicated
V-ing perfect
I couldn't have been communicating you couldn't have been communicating he couldn't have been communicating we couldn't have been communicating you couldn't have been communicating they couldn't 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
couldn't I communicate? couldn't you communicate? couldn't he communicate? couldn't we communicate? couldn't you communicate? couldn't they communicate?
V-ing form
couldn't I be communicating? couldn't you be communicating? couldn't he be communicating? couldn't we be communicating? couldn't you be communicating? couldn't they be communicating?
Perfect
couldn't I have communicated? couldn't you have communicated? couldn't he have communicated? couldn't we have communicated? couldn't you have communicated? couldn't they have communicated?
V-ing perfect
couldn't I have been communicating? couldn't you have been communicating? couldn't he have been communicating? couldn't we have been communicating? couldn't you have been communicating? couldn't they have been communicating?