I could shock you could shock she could shock we could shock you could shock they could shock
V-ing form
I could be shocking you could be shocking she could be shocking we could be shocking you could be shocking they could be shocking
Perfect
I could have shocked you could have shocked she 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 she 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 she 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 she 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 she 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 she 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 she shock? could we shock? could you shock? could they shock?
V-ing form
could I be shocking? could you be shocking? could she be shocking? could we be shocking? could you be shocking? could they be shocking?
Perfect
could I have shocked? could you have shocked? could she 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 she 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 she 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 she 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 she 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 she have been shocking? couldn't we have been shocking? couldn't you have been shocking? couldn't they have been shocking?