I could brown-nose you could brown-nose he could brown-nose we could brown-nose you could brown-nose they could brown-nose
V-ing form
I could be brown-nosing you could be brown-nosing he could be brown-nosing we could be brown-nosing you could be brown-nosing they could be brown-nosing
Perfect
I could have brown-nosed you could have brown-nosed he could have brown-nosed we could have brown-nosed you could have brown-nosed they could have brown-nosed
V-ing perfect
I could have been brown-nosing you could have been brown-nosing he could have been brown-nosing we could have been brown-nosing you could have been brown-nosing they could have been brown-nosing
Negation
Simple form
I couldn't brown-nose you couldn't brown-nose he couldn't brown-nose we couldn't brown-nose you couldn't brown-nose they couldn't brown-nose
V-ing form
I couldn't be brown-nosing you couldn't be brown-nosing he couldn't be brown-nosing we couldn't be brown-nosing you couldn't be brown-nosing they couldn't be brown-nosing
Perfect
I couldn't have brown-nosed you couldn't have brown-nosed he couldn't have brown-nosed we couldn't have brown-nosed you couldn't have brown-nosed they couldn't have brown-nosed
V-ing perfect
I couldn't have been brown-nosing you couldn't have been brown-nosing he couldn't have been brown-nosing we couldn't have been brown-nosing you couldn't have been brown-nosing they couldn't have been brown-nosing
Interrogative form
Simple form
could I brown-nose? could you brown-nose? could he brown-nose? could we brown-nose? could you brown-nose? could they brown-nose?
V-ing form
could I be brown-nosing? could you be brown-nosing? could he be brown-nosing? could we be brown-nosing? could you be brown-nosing? could they be brown-nosing?
Perfect
could I have brown-nosed? could you have brown-nosed? could he have brown-nosed? could we have brown-nosed? could you have brown-nosed? could they have brown-nosed?
V-ing perfect
could I have been brown-nosing? could you have been brown-nosing? could he have been brown-nosing? could we have been brown-nosing? could you have been brown-nosing? could they have been brown-nosing?
Interro-negative form
Simple form
couldn't I brown-nose? couldn't you brown-nose? couldn't he brown-nose? couldn't we brown-nose? couldn't you brown-nose? couldn't they brown-nose?
V-ing form
couldn't I be brown-nosing? couldn't you be brown-nosing? couldn't he be brown-nosing? couldn't we be brown-nosing? couldn't you be brown-nosing? couldn't they be brown-nosing?
Perfect
couldn't I have brown-nosed? couldn't you have brown-nosed? couldn't he have brown-nosed? couldn't we have brown-nosed? couldn't you have brown-nosed? couldn't they have brown-nosed?
V-ing perfect
couldn't I have been brown-nosing? couldn't you have been brown-nosing? couldn't he have been brown-nosing? couldn't we have been brown-nosing? couldn't you have been brown-nosing? couldn't they have been brown-nosing?