I could trap you could trap she could trap we could trap you could trap they could trap
V-ing form
I could be trapping you could be trapping she could be trapping we could be trapping you could be trapping they could be trapping
Perfect
I could have trapped you could have trapped she could have trapped we could have trapped you could have trapped they could have trapped
V-ing perfect
I could have been trapping you could have been trapping she could have been trapping we could have been trapping you could have been trapping they could have been trapping
Negation
Simple form
I couldn't trap you couldn't trap she couldn't trap we couldn't trap you couldn't trap they couldn't trap
V-ing form
I couldn't be trapping you couldn't be trapping she couldn't be trapping we couldn't be trapping you couldn't be trapping they couldn't be trapping
Perfect
I couldn't have trapped you couldn't have trapped she couldn't have trapped we couldn't have trapped you couldn't have trapped they couldn't have trapped
V-ing perfect
I couldn't have been trapping you couldn't have been trapping she couldn't have been trapping we couldn't have been trapping you couldn't have been trapping they couldn't have been trapping
Interrogative form
Simple form
could I trap? could you trap? could she trap? could we trap? could you trap? could they trap?
V-ing form
could I be trapping? could you be trapping? could she be trapping? could we be trapping? could you be trapping? could they be trapping?
Perfect
could I have trapped? could you have trapped? could she have trapped? could we have trapped? could you have trapped? could they have trapped?
V-ing perfect
could I have been trapping? could you have been trapping? could she have been trapping? could we have been trapping? could you have been trapping? could they have been trapping?
Interro-negative form
Simple form
couldn't I trap? couldn't you trap? couldn't she trap? couldn't we trap? couldn't you trap? couldn't they trap?
V-ing form
couldn't I be trapping? couldn't you be trapping? couldn't she be trapping? couldn't we be trapping? couldn't you be trapping? couldn't they be trapping?
Perfect
couldn't I have trapped? couldn't you have trapped? couldn't she have trapped? couldn't we have trapped? couldn't you have trapped? couldn't they have trapped?
V-ing perfect
couldn't I have been trapping? couldn't you have been trapping? couldn't she have been trapping? couldn't we have been trapping? couldn't you have been trapping? couldn't they have been trapping?