English verb conjugation
COULD OPINE

Regular verb: opine - opined - opined

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
I couldn't opine you couldn't opine he couldn't opine we couldn't opine you couldn't opine they couldn't opine	I couldn't be opining you couldn't be opining he couldn't be opining we couldn't be opining you couldn't be opining they couldn't be opining
Perfect	V-ing perfect
I couldn't have opined you couldn't have opined he couldn't have opined we couldn't have opined you couldn't have opined they couldn't have opined	I couldn't have been opining you couldn't have been opining he couldn't have been opining we couldn't have been opining you couldn't have been opining they couldn't have been opining

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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
couldn't I opine? couldn't you opine? couldn't he opine? couldn't we opine? couldn't you opine? couldn't they opine?	couldn't I be opining? couldn't you be opining? couldn't he be opining? couldn't we be opining? couldn't you be opining? couldn't they be opining?
Perfect	V-ing perfect
couldn't I have opined? couldn't you have opined? couldn't he have opined? couldn't we have opined? couldn't you have opined? couldn't they have opined?	couldn't I have been opining? couldn't you have been opining? couldn't he have been opining? couldn't we have been opining? couldn't you have been opining? couldn't they have been opining?