I could belch you could belch he could belch we could belch you could belch they could belch
V-ing form
I could be belching you could be belching he could be belching we could be belching you could be belching they could be belching
Perfect
I could have belched you could have belched he could have belched we could have belched you could have belched they could have belched
V-ing perfect
I could have been belching you could have been belching he could have been belching we could have been belching you could have been belching they could have been belching
Negation
Simple form
I could not belch you could not belch he could not belch we could not belch you could not belch they could not belch
V-ing form
I could not be belching you could not be belching he could not be belching we could not be belching you could not be belching they could not be belching
Perfect
I could not have belched you could not have belched he could not have belched we could not have belched you could not have belched they could not have belched
V-ing perfect
I could not have been belching you could not have been belching he could not have been belching we could not have been belching you could not have been belching they could not have been belching
Interrogative form
Simple form
could I belch? could you belch? could he belch? could we belch? could you belch? could they belch?
V-ing form
could I be belching? could you be belching? could he be belching? could we be belching? could you be belching? could they be belching?
Perfect
could I have belched? could you have belched? could he have belched? could we have belched? could you have belched? could they have belched?
V-ing perfect
could I have been belching? could you have been belching? could he have been belching? could we have been belching? could you have been belching? could they have been belching?
Interro-negative form
Simple form
could I not belch? could you not belch? could he not belch? could we not belch? could you not belch? could they not belch?
V-ing form
could I not be belching? could you not be belching? could he not be belching? could we not be belching? could you not be belching? could they not be belching?
Perfect
could I not have belched? could you not have belched? could he not have belched? could we not have belched? could you not have belched? could they not have belched?
V-ing perfect
could I not have been belching? could you not have been belching? could he not have been belching? could we not have been belching? could you not have been belching? could they not have been belching?