I could emit you could emit she could emit we could emit you could emit they could emit
V-ing form
I could be emitting you could be emitting she could be emitting we could be emitting you could be emitting they could be emitting
Perfect
I could have emitted you could have emitted she could have emitted we could have emitted you could have emitted they could have emitted
V-ing perfect
I could have been emitting you could have been emitting she could have been emitting we could have been emitting you could have been emitting they could have been emitting
Negation
Simple form
I could not emit you could not emit she could not emit we could not emit you could not emit they could not emit
V-ing form
I could not be emitting you could not be emitting she could not be emitting we could not be emitting you could not be emitting they could not be emitting
Perfect
I could not have emitted you could not have emitted she could not have emitted we could not have emitted you could not have emitted they could not have emitted
V-ing perfect
I could not have been emitting you could not have been emitting she could not have been emitting we could not have been emitting you could not have been emitting they could not have been emitting
Interrogative form
Simple form
could I emit? could you emit? could she emit? could we emit? could you emit? could they emit?
V-ing form
could I be emitting? could you be emitting? could she be emitting? could we be emitting? could you be emitting? could they be emitting?
Perfect
could I have emitted? could you have emitted? could she have emitted? could we have emitted? could you have emitted? could they have emitted?
V-ing perfect
could I have been emitting? could you have been emitting? could she have been emitting? could we have been emitting? could you have been emitting? could they have been emitting?
Interro-negative form
Simple form
could I not emit? could you not emit? could she not emit? could we not emit? could you not emit? could they not emit?
V-ing form
could I not be emitting? could you not be emitting? could she not be emitting? could we not be emitting? could you not be emitting? could they not be emitting?
Perfect
could I not have emitted? could you not have emitted? could she not have emitted? could we not have emitted? could you not have emitted? could they not have emitted?
V-ing perfect
could I not have been emitting? could you not have been emitting? could she not have been emitting? could we not have been emitting? could you not have been emitting? could they not have been emitting?