I could blurb you could blurb she could blurb we could blurb you could blurb they could blurb
V-ing form
I could be blurbing you could be blurbing she could be blurbing we could be blurbing you could be blurbing they could be blurbing
Perfect
I could have blurbed you could have blurbed she could have blurbed we could have blurbed you could have blurbed they could have blurbed
V-ing perfect
I could have been blurbing you could have been blurbing she could have been blurbing we could have been blurbing you could have been blurbing they could have been blurbing
Negation
Simple form
I couldn't blurb you couldn't blurb she couldn't blurb we couldn't blurb you couldn't blurb they couldn't blurb
V-ing form
I couldn't be blurbing you couldn't be blurbing she couldn't be blurbing we couldn't be blurbing you couldn't be blurbing they couldn't be blurbing
Perfect
I couldn't have blurbed you couldn't have blurbed she couldn't have blurbed we couldn't have blurbed you couldn't have blurbed they couldn't have blurbed
V-ing perfect
I couldn't have been blurbing you couldn't have been blurbing she couldn't have been blurbing we couldn't have been blurbing you couldn't have been blurbing they couldn't have been blurbing
Interrogative form
Simple form
could I blurb? could you blurb? could she blurb? could we blurb? could you blurb? could they blurb?
V-ing form
could I be blurbing? could you be blurbing? could she be blurbing? could we be blurbing? could you be blurbing? could they be blurbing?
Perfect
could I have blurbed? could you have blurbed? could she have blurbed? could we have blurbed? could you have blurbed? could they have blurbed?
V-ing perfect
could I have been blurbing? could you have been blurbing? could she have been blurbing? could we have been blurbing? could you have been blurbing? could they have been blurbing?
Interro-negative form
Simple form
couldn't I blurb? couldn't you blurb? couldn't she blurb? couldn't we blurb? couldn't you blurb? couldn't they blurb?
V-ing form
couldn't I be blurbing? couldn't you be blurbing? couldn't she be blurbing? couldn't we be blurbing? couldn't you be blurbing? couldn't they be blurbing?
Perfect
couldn't I have blurbed? couldn't you have blurbed? couldn't she have blurbed? couldn't we have blurbed? couldn't you have blurbed? couldn't they have blurbed?
V-ing perfect
couldn't I have been blurbing? couldn't you have been blurbing? couldn't she have been blurbing? couldn't we have been blurbing? couldn't you have been blurbing? couldn't they have been blurbing?