could instigate
Regular verb: instigate - instigated- instigated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could instigate
you could instigate
she could instigate
we could instigate
you could instigate
they could instigate 	I could be instigating
you could be instigating
she could be instigating
we could be instigating
you could be instigating
they could be instigating	I could have instigated
you could have instigated
she could have instigated
we could have instigated
you could have instigated
they could have instigated	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 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't instigate
you couldn't instigate
she couldn't instigate
we couldn't instigate
you couldn't instigate
they couldn't instigate 	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	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	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 	V-ing form 	Perfect 	V-ing perfect 	
could I instigate?
could you instigate?
could she instigate?
could we instigate?
could you instigate?
could they instigate? 	could I be instigating?
could you be instigating?
could she be instigating?
could we be instigating?
could you be instigating?
could they be instigating? 	could I have instigated?
could you have instigated?
could she have instigated?
could we have instigated?
could you have instigated?
could they have instigated? 	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 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I instigate?
couldn't you instigate?
couldn't she instigate?
couldn't we instigate?
couldn't you instigate?
couldn't they instigate? 	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? 	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? 	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?