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