I could slenderize you could slenderize she could slenderize we could slenderize you could slenderize they could slenderize
V-ing form
I could be slenderizing you could be slenderizing she could be slenderizing we could be slenderizing you could be slenderizing they could be slenderizing
Perfect
I could have slenderized you could have slenderized she could have slenderized we could have slenderized you could have slenderized they could have slenderized
V-ing perfect
I could have been slenderizing you could have been slenderizing she could have been slenderizing we could have been slenderizing you could have been slenderizing they could have been slenderizing
Negation
Simple form
I couldn't slenderize you couldn't slenderize she couldn't slenderize we couldn't slenderize you couldn't slenderize they couldn't slenderize
V-ing form
I couldn't be slenderizing you couldn't be slenderizing she couldn't be slenderizing we couldn't be slenderizing you couldn't be slenderizing they couldn't be slenderizing
Perfect
I couldn't have slenderized you couldn't have slenderized she couldn't have slenderized we couldn't have slenderized you couldn't have slenderized they couldn't have slenderized
V-ing perfect
I couldn't have been slenderizing you couldn't have been slenderizing she couldn't have been slenderizing we couldn't have been slenderizing you couldn't have been slenderizing they couldn't have been slenderizing
Interrogative form
Simple form
could I slenderize? could you slenderize? could she slenderize? could we slenderize? could you slenderize? could they slenderize?
V-ing form
could I be slenderizing? could you be slenderizing? could she be slenderizing? could we be slenderizing? could you be slenderizing? could they be slenderizing?
Perfect
could I have slenderized? could you have slenderized? could she have slenderized? could we have slenderized? could you have slenderized? could they have slenderized?
V-ing perfect
could I have been slenderizing? could you have been slenderizing? could she have been slenderizing? could we have been slenderizing? could you have been slenderizing? could they have been slenderizing?
Interro-negative form
Simple form
couldn't I slenderize? couldn't you slenderize? couldn't she slenderize? couldn't we slenderize? couldn't you slenderize? couldn't they slenderize?
V-ing form
couldn't I be slenderizing? couldn't you be slenderizing? couldn't she be slenderizing? couldn't we be slenderizing? couldn't you be slenderizing? couldn't they be slenderizing?
Perfect
couldn't I have slenderized? couldn't you have slenderized? couldn't she have slenderized? couldn't we have slenderized? couldn't you have slenderized? couldn't they have slenderized?
V-ing perfect
couldn't I have been slenderizing? couldn't you have been slenderizing? couldn't she have been slenderizing? couldn't we have been slenderizing? couldn't you have been slenderizing? couldn't they have been slenderizing?