could philosophize
Regular verb: philosophize - philosophized- philosophized

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could philosophize
you could philosophize
he could philosophize
we could philosophize
you could philosophize
they could philosophize 	I could be philosophizing
you could be philosophizing
he could be philosophizing
we could be philosophizing
you could be philosophizing
they could be philosophizing	I could have philosophized
you could have philosophized
he could have philosophized
we could have philosophized
you could have philosophized
they could have philosophized	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 	V-ing form 	Perfect 	V-ing perfect 	
I could not philosophize
you could not philosophize
he could not philosophize
we could not philosophize
you could not philosophize
they could not philosophize 	I could not be philosophizing
you could not be philosophizing
he could not be philosophizing
we could not be philosophizing
you could not be philosophizing
they could not be philosophizing	I could not have philosophized
you could not have philosophized
he could not have philosophized
we could not have philosophized
you could not have philosophized
they could not have philosophized	I could not have been philosophizing
you could not have been philosophizing
he could not have been philosophizing
we could not have been philosophizing
you could not have been philosophizing
they could not have been philosophizing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I philosophize?
could you philosophize?
could he philosophize?
could we philosophize?
could you philosophize?
could they philosophize? 	could I be philosophizing?
could you be philosophizing?
could he be philosophizing?
could we be philosophizing?
could you be philosophizing?
could they be philosophizing? 	could I have philosophized?
could you have philosophized?
could he have philosophized?
could we have philosophized?
could you have philosophized?
could they have philosophized? 	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 	V-ing form 	Perfect 	V-ing perfect 	
could I not philosophize?
could you not philosophize?
could he not philosophize?
could we not philosophize?
could you not philosophize?
could they not philosophize? 	could I not be philosophizing?
could you not be philosophizing?
could he not be philosophizing?
could we not be philosophizing?
could you not be philosophizing?
could they not be philosophizing? 	could I not have philosophized?
could you not have philosophized?
could he not have philosophized?
could we not have philosophized?
could you not have philosophized?
could they not have philosophized? 	could I not have been philosophizing?
could you not have been philosophizing?
could he not have been philosophizing?
could we not have been philosophizing?
could you not have been philosophizing?
could they not have been philosophizing?