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