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