I could instigate you could instigate he could instigate we could instigate you could instigate they could instigate
V-ing form
I could be instigating you could be instigating he could be instigating we could be instigating you could be instigating they could be instigating
Perfect
I could have instigated you could have instigated he 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 he 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 he 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 he 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 he 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 he 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 he instigate? could we instigate? could you instigate? could they instigate?
V-ing form
could I be instigating? could you be instigating? could he be instigating? could we be instigating? could you be instigating? could they be instigating?
Perfect
could I have instigated? could you have instigated? could he 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 he 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 he 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 he 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 he 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 he have been instigating? couldn't we have been instigating? couldn't you have been instigating? couldn't they have been instigating?