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