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