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