I could brevet you could brevet she could brevet we could brevet you could brevet they could brevet
V-ing form
I could be breveting you could be breveting she could be breveting we could be breveting you could be breveting they could be breveting
Perfect
I could have breveted you could have breveted she 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 she 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 she 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 she 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 she 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 she 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 she brevet? could we brevet? could you brevet? could they brevet?
V-ing form
could I be breveting? could you be breveting? could she be breveting? could we be breveting? could you be breveting? could they be breveting?
Perfect
could I have breveted? could you have breveted? could she 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 she 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 she 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 she 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 she 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 she not have been breveting? could we not have been breveting? could you not have been breveting? could they not have been breveting?