I could buggar you could buggar she could buggar we could buggar you could buggar they could buggar
V-ing form
I could be buggaring you could be buggaring she could be buggaring we could be buggaring you could be buggaring they could be buggaring
Perfect
I could have buggared you could have buggared she could have buggared we could have buggared you could have buggared they could have buggared
V-ing perfect
I could have been buggaring you could have been buggaring she could have been buggaring we could have been buggaring you could have been buggaring they could have been buggaring
Negation
Simple form
I couldn't buggar you couldn't buggar she couldn't buggar we couldn't buggar you couldn't buggar they couldn't buggar
V-ing form
I couldn't be buggaring you couldn't be buggaring she couldn't be buggaring we couldn't be buggaring you couldn't be buggaring they couldn't be buggaring
Perfect
I couldn't have buggared you couldn't have buggared she couldn't have buggared we couldn't have buggared you couldn't have buggared they couldn't have buggared
V-ing perfect
I couldn't have been buggaring you couldn't have been buggaring she couldn't have been buggaring we couldn't have been buggaring you couldn't have been buggaring they couldn't have been buggaring
Interrogative form
Simple form
could I buggar? could you buggar? could she buggar? could we buggar? could you buggar? could they buggar?
V-ing form
could I be buggaring? could you be buggaring? could she be buggaring? could we be buggaring? could you be buggaring? could they be buggaring?
Perfect
could I have buggared? could you have buggared? could she have buggared? could we have buggared? could you have buggared? could they have buggared?
V-ing perfect
could I have been buggaring? could you have been buggaring? could she have been buggaring? could we have been buggaring? could you have been buggaring? could they have been buggaring?
Interro-negative form
Simple form
couldn't I buggar? couldn't you buggar? couldn't she buggar? couldn't we buggar? couldn't you buggar? couldn't they buggar?
V-ing form
couldn't I be buggaring? couldn't you be buggaring? couldn't she be buggaring? couldn't we be buggaring? couldn't you be buggaring? couldn't they be buggaring?
Perfect
couldn't I have buggared? couldn't you have buggared? couldn't she have buggared? couldn't we have buggared? couldn't you have buggared? couldn't they have buggared?
V-ing perfect
couldn't I have been buggaring? couldn't you have been buggaring? couldn't she have been buggaring? couldn't we have been buggaring? couldn't you have been buggaring? couldn't they have been buggaring?