I could aprize you could aprize he could aprize we could aprize you could aprize they could aprize
V-ing form
I could be aprizing you could be aprizing he could be aprizing we could be aprizing you could be aprizing they could be aprizing
Perfect
I could have aprized you could have aprized he could have aprized we could have aprized you could have aprized they could have aprized
V-ing perfect
I could have been aprizing you could have been aprizing he could have been aprizing we could have been aprizing you could have been aprizing they could have been aprizing
Negation
Simple form
I couldn't aprize you couldn't aprize he couldn't aprize we couldn't aprize you couldn't aprize they couldn't aprize
V-ing form
I couldn't be aprizing you couldn't be aprizing he couldn't be aprizing we couldn't be aprizing you couldn't be aprizing they couldn't be aprizing
Perfect
I couldn't have aprized you couldn't have aprized he couldn't have aprized we couldn't have aprized you couldn't have aprized they couldn't have aprized
V-ing perfect
I couldn't have been aprizing you couldn't have been aprizing he couldn't have been aprizing we couldn't have been aprizing you couldn't have been aprizing they couldn't have been aprizing
Interrogative form
Simple form
could I aprize? could you aprize? could he aprize? could we aprize? could you aprize? could they aprize?
V-ing form
could I be aprizing? could you be aprizing? could he be aprizing? could we be aprizing? could you be aprizing? could they be aprizing?
Perfect
could I have aprized? could you have aprized? could he have aprized? could we have aprized? could you have aprized? could they have aprized?
V-ing perfect
could I have been aprizing? could you have been aprizing? could he have been aprizing? could we have been aprizing? could you have been aprizing? could they have been aprizing?
Interro-negative form
Simple form
couldn't I aprize? couldn't you aprize? couldn't he aprize? couldn't we aprize? couldn't you aprize? couldn't they aprize?
V-ing form
couldn't I be aprizing? couldn't you be aprizing? couldn't he be aprizing? couldn't we be aprizing? couldn't you be aprizing? couldn't they be aprizing?
Perfect
couldn't I have aprized? couldn't you have aprized? couldn't he have aprized? couldn't we have aprized? couldn't you have aprized? couldn't they have aprized?
V-ing perfect
couldn't I have been aprizing? couldn't you have been aprizing? couldn't he have been aprizing? couldn't we have been aprizing? couldn't you have been aprizing? couldn't they have been aprizing?