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