I could platinize you could platinize he could platinize we could platinize you could platinize they could platinize
V-ing form
I could be platinizing you could be platinizing he could be platinizing we could be platinizing you could be platinizing they could be platinizing
Perfect
I could have platinized you could have platinized he could have platinized we could have platinized you could have platinized they could have platinized
V-ing perfect
I could have been platinizing you could have been platinizing he could have been platinizing we could have been platinizing you could have been platinizing they could have been platinizing
Negation
Simple form
I could not platinize you could not platinize he could not platinize we could not platinize you could not platinize they could not platinize
V-ing form
I could not be platinizing you could not be platinizing he could not be platinizing we could not be platinizing you could not be platinizing they could not be platinizing
Perfect
I could not have platinized you could not have platinized he could not have platinized we could not have platinized you could not have platinized they could not have platinized
V-ing perfect
I could not have been platinizing you could not have been platinizing he could not have been platinizing we could not have been platinizing you could not have been platinizing they could not have been platinizing
Interrogative form
Simple form
could I platinize? could you platinize? could he platinize? could we platinize? could you platinize? could they platinize?
V-ing form
could I be platinizing? could you be platinizing? could he be platinizing? could we be platinizing? could you be platinizing? could they be platinizing?
Perfect
could I have platinized? could you have platinized? could he have platinized? could we have platinized? could you have platinized? could they have platinized?
V-ing perfect
could I have been platinizing? could you have been platinizing? could he have been platinizing? could we have been platinizing? could you have been platinizing? could they have been platinizing?
Interro-negative form
Simple form
could I not platinize? could you not platinize? could he not platinize? could we not platinize? could you not platinize? could they not platinize?
V-ing form
could I not be platinizing? could you not be platinizing? could he not be platinizing? could we not be platinizing? could you not be platinizing? could they not be platinizing?
Perfect
could I not have platinized? could you not have platinized? could he not have platinized? could we not have platinized? could you not have platinized? could they not have platinized?
V-ing perfect
could I not have been platinizing? could you not have been platinizing? could he not have been platinizing? could we not have been platinizing? could you not have been platinizing? could they not have been platinizing?