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