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