I could meet you could meet he could meet we could meet you could meet they could meet
V-ing form
I could be meeting you could be meeting he could be meeting we could be meeting you could be meeting they could be meeting
Perfect
I could have met you could have met he could have met we could have met you could have met they could have met
V-ing perfect
I could have been meeting you could have been meeting he could have been meeting we could have been meeting you could have been meeting they could have been meeting
Negation
Simple form
I couldn't meet you couldn't meet he couldn't meet we couldn't meet you couldn't meet they couldn't meet
V-ing form
I couldn't be meeting you couldn't be meeting he couldn't be meeting we couldn't be meeting you couldn't be meeting they couldn't be meeting
Perfect
I couldn't have met you couldn't have met he couldn't have met we couldn't have met you couldn't have met they couldn't have met
V-ing perfect
I couldn't have been meeting you couldn't have been meeting he couldn't have been meeting we couldn't have been meeting you couldn't have been meeting they couldn't have been meeting
Interrogative form
Simple form
could I meet? could you meet? could he meet? could we meet? could you meet? could they meet?
V-ing form
could I be meeting? could you be meeting? could he be meeting? could we be meeting? could you be meeting? could they be meeting?
Perfect
could I have met? could you have met? could he have met? could we have met? could you have met? could they have met?
V-ing perfect
could I have been meeting? could you have been meeting? could he have been meeting? could we have been meeting? could you have been meeting? could they have been meeting?
Interro-negative form
Simple form
couldn't I meet? couldn't you meet? couldn't he meet? couldn't we meet? couldn't you meet? couldn't they meet?
V-ing form
couldn't I be meeting? couldn't you be meeting? couldn't he be meeting? couldn't we be meeting? couldn't you be meeting? couldn't they be meeting?
Perfect
couldn't I have met? couldn't you have met? couldn't he have met? couldn't we have met? couldn't you have met? couldn't they have met?
V-ing perfect
couldn't I have been meeting? couldn't you have been meeting? couldn't he have been meeting? couldn't we have been meeting? couldn't you have been meeting? couldn't they have been meeting?