could opine
Regular verb: opine - opined- opined

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could opine
you could opine
he could opine
we could opine
you could opine
they could opine 	I could be opining
you could be opining
he could be opining
we could be opining
you could be opining
they could be opining	I could have opined
you could have opined
he could have opined
we could have opined
you could have opined
they could have opined	I could have been opining
you could have been opining
he could have been opining
we could have been opining
you could have been opining
they could have been opining	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not opine
you could not opine
he could not opine
we could not opine
you could not opine
they could not opine 	I could not be opining
you could not be opining
he could not be opining
we could not be opining
you could not be opining
they could not be opining	I could not have opined
you could not have opined
he could not have opined
we could not have opined
you could not have opined
they could not have opined	I could not have been opining
you could not have been opining
he could not have been opining
we could not have been opining
you could not have been opining
they could not have been opining	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I opine?
could you opine?
could he opine?
could we opine?
could you opine?
could they opine? 	could I be opining?
could you be opining?
could he be opining?
could we be opining?
could you be opining?
could they be opining? 	could I have opined?
could you have opined?
could he have opined?
could we have opined?
could you have opined?
could they have opined? 	could I have been opining?
could you have been opining?
could he have been opining?
could we have been opining?
could you have been opining?
could they have been opining? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not opine?
could you not opine?
could he not opine?
could we not opine?
could you not opine?
could they not opine? 	could I not be opining?
could you not be opining?
could he not be opining?
could we not be opining?
could you not be opining?
could they not be opining? 	could I not have opined?
could you not have opined?
could he not have opined?
could we not have opined?
could you not have opined?
could they not have opined? 	could I not have been opining?
could you not have been opining?
could he not have been opining?
could we not have been opining?
could you not have been opining?
could they not have been opining?