could summarize
Regular verb: summarize - summarized- summarized

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could summarize
you could summarize
she could summarize
we could summarize
you could summarize
they could summarize 	I could be summarizing
you could be summarizing
she could be summarizing
we could be summarizing
you could be summarizing
they could be summarizing	I could have summarized
you could have summarized
she 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
she 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 couldn't summarize
you couldn't summarize
she couldn't summarize
we couldn't summarize
you couldn't summarize
they couldn't summarize 	I couldn't be summarizing
you couldn't be summarizing
she couldn't be summarizing
we couldn't be summarizing
you couldn't be summarizing
they couldn't be summarizing	I couldn't have summarized
you couldn't have summarized
she couldn't have summarized
we couldn't have summarized
you couldn't have summarized
they couldn't have summarized	I couldn't have been summarizing
you couldn't have been summarizing
she couldn't have been summarizing
we couldn't have been summarizing
you couldn't have been summarizing
they couldn't have been summarizing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I summarize?
could you summarize?
could she summarize?
could we summarize?
could you summarize?
could they summarize? 	could I be summarizing?
could you be summarizing?
could she be summarizing?
could we be summarizing?
could you be summarizing?
could they be summarizing? 	could I have summarized?
could you have summarized?
could she 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 she 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 	
couldn't I summarize?
couldn't you summarize?
couldn't she summarize?
couldn't we summarize?
couldn't you summarize?
couldn't they summarize? 	couldn't I be summarizing?
couldn't you be summarizing?
couldn't she be summarizing?
couldn't we be summarizing?
couldn't you be summarizing?
couldn't they be summarizing? 	couldn't I have summarized?
couldn't you have summarized?
couldn't she have summarized?
couldn't we have summarized?
couldn't you have summarized?
couldn't they have summarized? 	couldn't I have been summarizing?
couldn't you have been summarizing?
couldn't she have been summarizing?
couldn't we have been summarizing?
couldn't you have been summarizing?
couldn't they have been summarizing?