I could oppose you could oppose she could oppose we could oppose you could oppose they could oppose
V-ing form
I could be opposing you could be opposing she could be opposing we could be opposing you could be opposing they could be opposing
Perfect
I could have opposed you could have opposed she could have opposed we could have opposed you could have opposed they could have opposed
V-ing perfect
I could have been opposing you could have been opposing she could have been opposing we could have been opposing you could have been opposing they could have been opposing
Negation
Simple form
I could not oppose you could not oppose she could not oppose we could not oppose you could not oppose they could not oppose
V-ing form
I could not be opposing you could not be opposing she could not be opposing we could not be opposing you could not be opposing they could not be opposing
Perfect
I could not have opposed you could not have opposed she could not have opposed we could not have opposed you could not have opposed they could not have opposed
V-ing perfect
I could not have been opposing you could not have been opposing she could not have been opposing we could not have been opposing you could not have been opposing they could not have been opposing
Interrogative form
Simple form
could I oppose? could you oppose? could she oppose? could we oppose? could you oppose? could they oppose?
V-ing form
could I be opposing? could you be opposing? could she be opposing? could we be opposing? could you be opposing? could they be opposing?
Perfect
could I have opposed? could you have opposed? could she have opposed? could we have opposed? could you have opposed? could they have opposed?
V-ing perfect
could I have been opposing? could you have been opposing? could she have been opposing? could we have been opposing? could you have been opposing? could they have been opposing?
Interro-negative form
Simple form
could I not oppose? could you not oppose? could she not oppose? could we not oppose? could you not oppose? could they not oppose?
V-ing form
could I not be opposing? could you not be opposing? could she not be opposing? could we not be opposing? could you not be opposing? could they not be opposing?
Perfect
could I not have opposed? could you not have opposed? could she not have opposed? could we not have opposed? could you not have opposed? could they not have opposed?
V-ing perfect
could I not have been opposing? could you not have been opposing? could she not have been opposing? could we not have been opposing? could you not have been opposing? could they not have been opposing?