could summarize
Regular verb: summarize - summarized- summarized

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could summarize
you could summarize
he could summarize
we could summarize
you could summarize
they could summarize 	I could be summarizing
you could be summarizing
he could be summarizing
we could be summarizing
you could be summarizing
they could be summarizing	I could have summarized
you could have summarized
he could have summarized
we could have summarized
you could have summarized
they could have summarized	I could have been summarizing
you could have been summarizing
he could have been summarizing
we could have been summarizing
you could have been summarizing
they could have been summarizing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not summarize
you could not summarize
he could not summarize
we could not summarize
you could not summarize
they could not summarize 	I could not be summarizing
you could not be summarizing
he could not be summarizing
we could not be summarizing
you could not be summarizing
they could not be summarizing	I could not have summarized
you could not have summarized
he could not have summarized
we could not have summarized
you could not have summarized
they could not have summarized	I could not have been summarizing
you could not have been summarizing
he could not have been summarizing
we could not have been summarizing
you could not have been summarizing
they could not have been summarizing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I summarize?
could you summarize?
could he summarize?
could we summarize?
could you summarize?
could they summarize? 	could I be summarizing?
could you be summarizing?
could he be summarizing?
could we be summarizing?
could you be summarizing?
could they be summarizing? 	could I have summarized?
could you have summarized?
could he have summarized?
could we have summarized?
could you have summarized?
could they have summarized? 	could I have been summarizing?
could you have been summarizing?
could he have been summarizing?
could we have been summarizing?
could you have been summarizing?
could they have been summarizing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not summarize?
could you not summarize?
could he not summarize?
could we not summarize?
could you not summarize?
could they not summarize? 	could I not be summarizing?
could you not be summarizing?
could he not be summarizing?
could we not be summarizing?
could you not be summarizing?
could they not be summarizing? 	could I not have summarized?
could you not have summarized?
could he not have summarized?
could we not have summarized?
could you not have summarized?
could they not have summarized? 	could I not have been summarizing?
could you not have been summarizing?
could he not have been summarizing?
could we not have been summarizing?
could you not have been summarizing?
could they not have been summarizing?