I could brevet you could brevet he could brevet we could brevet you could brevet they could brevet
V-ing form
I could be breveting you could be breveting he could be breveting we could be breveting you could be breveting they could be breveting
Perfect
I could have breveted you could have breveted he could have breveted we could have breveted you could have breveted they could have breveted
V-ing perfect
I could have been breveting you could have been breveting he could have been breveting we could have been breveting you could have been breveting they could have been breveting
Negation
Simple form
I could not brevet you could not brevet he could not brevet we could not brevet you could not brevet they could not brevet
V-ing form
I could not be breveting you could not be breveting he could not be breveting we could not be breveting you could not be breveting they could not be breveting
Perfect
I could not have breveted you could not have breveted he could not have breveted we could not have breveted you could not have breveted they could not have breveted
V-ing perfect
I could not have been breveting you could not have been breveting he could not have been breveting we could not have been breveting you could not have been breveting they could not have been breveting
Interrogative form
Simple form
could I brevet? could you brevet? could he brevet? could we brevet? could you brevet? could they brevet?
V-ing form
could I be breveting? could you be breveting? could he be breveting? could we be breveting? could you be breveting? could they be breveting?
Perfect
could I have breveted? could you have breveted? could he have breveted? could we have breveted? could you have breveted? could they have breveted?
V-ing perfect
could I have been breveting? could you have been breveting? could he have been breveting? could we have been breveting? could you have been breveting? could they have been breveting?
Interro-negative form
Simple form
could I not brevet? could you not brevet? could he not brevet? could we not brevet? could you not brevet? could they not brevet?
V-ing form
could I not be breveting? could you not be breveting? could he not be breveting? could we not be breveting? could you not be breveting? could they not be breveting?
Perfect
could I not have breveted? could you not have breveted? could he not have breveted? could we not have breveted? could you not have breveted? could they not have breveted?
V-ing perfect
could I not have been breveting? could you not have been breveting? could he not have been breveting? could we not have been breveting? could you not have been breveting? could they not have been breveting?