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 couldn't summer you couldn't summer he couldn't summer we couldn't summer you couldn't summer they couldn't summer	I couldn't be summering you couldn't be summering he couldn't be summering we couldn't be summering you couldn't be summering they couldn't be summering
Perfect	V-ing perfect
I couldn't have summered you couldn't have summered he couldn't have summered we couldn't have summered you couldn't have summered they couldn't have summered	I couldn't have been summering you couldn't have been summering he couldn't have been summering we couldn't have been summering you couldn't have been summering they couldn't 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
couldn't I summer? couldn't you summer? couldn't he summer? couldn't we summer? couldn't you summer? couldn't they summer?	couldn't I be summering? couldn't you be summering? couldn't he be summering? couldn't we be summering? couldn't you be summering? couldn't they be summering?
Perfect	V-ing perfect
couldn't I have summered? couldn't you have summered? couldn't he have summered? couldn't we have summered? couldn't you have summered? couldn't they have summered?	couldn't I have been summering? couldn't you have been summering? couldn't he have been summering? couldn't we have been summering? couldn't you have been summering? couldn't they have been summering?