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