I could garage you could garage he could garage we could garage you could garage they could garage
V-ing form
I could be garaging you could be garaging he could be garaging we could be garaging you could be garaging they could be garaging
Perfect
I could have garaged you could have garaged he could have garaged we could have garaged you could have garaged they could have garaged
V-ing perfect
I could have been garaging you could have been garaging he could have been garaging we could have been garaging you could have been garaging they could have been garaging
Negation
Simple form
I couldn't garage you couldn't garage he couldn't garage we couldn't garage you couldn't garage they couldn't garage
V-ing form
I couldn't be garaging you couldn't be garaging he couldn't be garaging we couldn't be garaging you couldn't be garaging they couldn't be garaging
Perfect
I couldn't have garaged you couldn't have garaged he couldn't have garaged we couldn't have garaged you couldn't have garaged they couldn't have garaged
V-ing perfect
I couldn't have been garaging you couldn't have been garaging he couldn't have been garaging we couldn't have been garaging you couldn't have been garaging they couldn't have been garaging
Interrogative form
Simple form
could I garage? could you garage? could he garage? could we garage? could you garage? could they garage?
V-ing form
could I be garaging? could you be garaging? could he be garaging? could we be garaging? could you be garaging? could they be garaging?
Perfect
could I have garaged? could you have garaged? could he have garaged? could we have garaged? could you have garaged? could they have garaged?
V-ing perfect
could I have been garaging? could you have been garaging? could he have been garaging? could we have been garaging? could you have been garaging? could they have been garaging?
Interro-negative form
Simple form
couldn't I garage? couldn't you garage? couldn't he garage? couldn't we garage? couldn't you garage? couldn't they garage?
V-ing form
couldn't I be garaging? couldn't you be garaging? couldn't he be garaging? couldn't we be garaging? couldn't you be garaging? couldn't they be garaging?
Perfect
couldn't I have garaged? couldn't you have garaged? couldn't he have garaged? couldn't we have garaged? couldn't you have garaged? couldn't they have garaged?
V-ing perfect
couldn't I have been garaging? couldn't you have been garaging? couldn't he have been garaging? couldn't we have been garaging? couldn't you have been garaging? couldn't they have been garaging?