English verb conjugation
COULD SUMMER

Regular verb: summer - summered - summered

Affirmation

Simple form	V-ing form
I could summer you could summer he could summer we could summer you could summer they could summer	I could be summering you could be summering he could be summering we could be summering you could be summering they could be summering
Perfect	V-ing perfect
I could have summered you could have summered he could have summered we could have summered you could have summered they could have summered	I could have been summering you could have been summering he could have been summering we could have been summering you could have been summering they could have been summering

Negation

Simple form	V-ing form
I could not summer you could not summer he could not summer we could not summer you could not summer they could not summer	I could not be summering you could not be summering he could not be summering we could not be summering you could not be summering they could not be summering
Perfect	V-ing perfect
I could not have summered you could not have summered he could not have summered we could not have summered you could not have summered they could not have summered	I could not have been summering you could not have been summering he could not have been summering we could not have been summering you could not have been summering they could not have been summering

Interrogative form

Simple form	V-ing form
could I summer? could you summer? could he summer? could we summer? could you summer? could they summer?	could I be summering? could you be summering? could he be summering? could we be summering? could you be summering? could they be summering?
Perfect	V-ing perfect
could I have summered? could you have summered? could he have summered? could we have summered? could you have summered? could they have summered?	could I have been summering? could you have been summering? could he have been summering? could we have been summering? could you have been summering? could they have been summering?

Interro-negative form

Simple form	V-ing form
could I not summer? could you not summer? could he not summer? could we not summer? could you not summer? could they not summer?	could I not be summering? could you not be summering? could he not be summering? could we not be summering? could you not be summering? could they not be summering?
Perfect	V-ing perfect
could I not have summered? could you not have summered? could he not have summered? could we not have summered? could you not have summered? could they not have summered?	could I not have been summering? could you not have been summering? could he not have been summering? could we not have been summering? could you not have been summering? could they not have been summering?