English verb conjugation
COULD RETROSPECT

Regular verb: retrospect - retrospected - retrospected

Affirmation

Simple form	V-ing form
I could retrospect you could retrospect he could retrospect we could retrospect you could retrospect they could retrospect	I could be retrospecting you could be retrospecting he could be retrospecting we could be retrospecting you could be retrospecting they could be retrospecting
Perfect	V-ing perfect
I could have retrospected you could have retrospected he could have retrospected we could have retrospected you could have retrospected they could have retrospected	I could have been retrospecting you could have been retrospecting he could have been retrospecting we could have been retrospecting you could have been retrospecting they could have been retrospecting

Negation

Simple form	V-ing form
I couldn't retrospect you couldn't retrospect he couldn't retrospect we couldn't retrospect you couldn't retrospect they couldn't retrospect	I couldn't be retrospecting you couldn't be retrospecting he couldn't be retrospecting we couldn't be retrospecting you couldn't be retrospecting they couldn't be retrospecting
Perfect	V-ing perfect
I couldn't have retrospected you couldn't have retrospected he couldn't have retrospected we couldn't have retrospected you couldn't have retrospected they couldn't have retrospected	I couldn't have been retrospecting you couldn't have been retrospecting he couldn't have been retrospecting we couldn't have been retrospecting you couldn't have been retrospecting they couldn't have been retrospecting

Interrogative form

Simple form	V-ing form
could I retrospect? could you retrospect? could he retrospect? could we retrospect? could you retrospect? could they retrospect?	could I be retrospecting? could you be retrospecting? could he be retrospecting? could we be retrospecting? could you be retrospecting? could they be retrospecting?
Perfect	V-ing perfect
could I have retrospected? could you have retrospected? could he have retrospected? could we have retrospected? could you have retrospected? could they have retrospected?	could I have been retrospecting? could you have been retrospecting? could he have been retrospecting? could we have been retrospecting? could you have been retrospecting? could they have been retrospecting?

Interro-negative form

Simple form	V-ing form
couldn't I retrospect? couldn't you retrospect? couldn't he retrospect? couldn't we retrospect? couldn't you retrospect? couldn't they retrospect?	couldn't I be retrospecting? couldn't you be retrospecting? couldn't he be retrospecting? couldn't we be retrospecting? couldn't you be retrospecting? couldn't they be retrospecting?
Perfect	V-ing perfect
couldn't I have retrospected? couldn't you have retrospected? couldn't he have retrospected? couldn't we have retrospected? couldn't you have retrospected? couldn't they have retrospected?	couldn't I have been retrospecting? couldn't you have been retrospecting? couldn't he have been retrospecting? couldn't we have been retrospecting? couldn't you have been retrospecting? couldn't they have been retrospecting?