I could leaflet you could leaflet he could leaflet we could leaflet you could leaflet they could leaflet
V-ing form
I could be leafleting you could be leafleting he could be leafleting we could be leafleting you could be leafleting they could be leafleting
Perfect
I could have leafleted you could have leafleted he could have leafleted we could have leafleted you could have leafleted they could have leafleted
V-ing perfect
I could have been leafleting you could have been leafleting he could have been leafleting we could have been leafleting you could have been leafleting they could have been leafleting
Negation
Simple form
I could not leaflet you could not leaflet he could not leaflet we could not leaflet you could not leaflet they could not leaflet
V-ing form
I could not be leafleting you could not be leafleting he could not be leafleting we could not be leafleting you could not be leafleting they could not be leafleting
Perfect
I could not have leafleted you could not have leafleted he could not have leafleted we could not have leafleted you could not have leafleted they could not have leafleted
V-ing perfect
I could not have been leafleting you could not have been leafleting he could not have been leafleting we could not have been leafleting you could not have been leafleting they could not have been leafleting
Interrogative form
Simple form
could I leaflet? could you leaflet? could he leaflet? could we leaflet? could you leaflet? could they leaflet?
V-ing form
could I be leafleting? could you be leafleting? could he be leafleting? could we be leafleting? could you be leafleting? could they be leafleting?
Perfect
could I have leafleted? could you have leafleted? could he have leafleted? could we have leafleted? could you have leafleted? could they have leafleted?
V-ing perfect
could I have been leafleting? could you have been leafleting? could he have been leafleting? could we have been leafleting? could you have been leafleting? could they have been leafleting?
Interro-negative form
Simple form
could I not leaflet? could you not leaflet? could he not leaflet? could we not leaflet? could you not leaflet? could they not leaflet?
V-ing form
could I not be leafleting? could you not be leafleting? could he not be leafleting? could we not be leafleting? could you not be leafleting? could they not be leafleting?
Perfect
could I not have leafleted? could you not have leafleted? could he not have leafleted? could we not have leafleted? could you not have leafleted? could they not have leafleted?
V-ing perfect
could I not have been leafleting? could you not have been leafleting? could he not have been leafleting? could we not have been leafleting? could you not have been leafleting? could they not have been leafleting?