I could flabbergast you could flabbergast he could flabbergast we could flabbergast you could flabbergast they could flabbergast
V-ing form
I could be flabbergasting you could be flabbergasting he could be flabbergasting we could be flabbergasting you could be flabbergasting they could be flabbergasting
Perfect
I could have flabbergasted you could have flabbergasted he could have flabbergasted we could have flabbergasted you could have flabbergasted they could have flabbergasted
V-ing perfect
I could have been flabbergasting you could have been flabbergasting he could have been flabbergasting we could have been flabbergasting you could have been flabbergasting they could have been flabbergasting
Negation
Simple form
I couldn't flabbergast you couldn't flabbergast he couldn't flabbergast we couldn't flabbergast you couldn't flabbergast they couldn't flabbergast
V-ing form
I couldn't be flabbergasting you couldn't be flabbergasting he couldn't be flabbergasting we couldn't be flabbergasting you couldn't be flabbergasting they couldn't be flabbergasting
Perfect
I couldn't have flabbergasted you couldn't have flabbergasted he couldn't have flabbergasted we couldn't have flabbergasted you couldn't have flabbergasted they couldn't have flabbergasted
V-ing perfect
I couldn't have been flabbergasting you couldn't have been flabbergasting he couldn't have been flabbergasting we couldn't have been flabbergasting you couldn't have been flabbergasting they couldn't have been flabbergasting
Interrogative form
Simple form
could I flabbergast? could you flabbergast? could he flabbergast? could we flabbergast? could you flabbergast? could they flabbergast?
V-ing form
could I be flabbergasting? could you be flabbergasting? could he be flabbergasting? could we be flabbergasting? could you be flabbergasting? could they be flabbergasting?
Perfect
could I have flabbergasted? could you have flabbergasted? could he have flabbergasted? could we have flabbergasted? could you have flabbergasted? could they have flabbergasted?
V-ing perfect
could I have been flabbergasting? could you have been flabbergasting? could he have been flabbergasting? could we have been flabbergasting? could you have been flabbergasting? could they have been flabbergasting?
Interro-negative form
Simple form
couldn't I flabbergast? couldn't you flabbergast? couldn't he flabbergast? couldn't we flabbergast? couldn't you flabbergast? couldn't they flabbergast?
V-ing form
couldn't I be flabbergasting? couldn't you be flabbergasting? couldn't he be flabbergasting? couldn't we be flabbergasting? couldn't you be flabbergasting? couldn't they be flabbergasting?
Perfect
couldn't I have flabbergasted? couldn't you have flabbergasted? couldn't he have flabbergasted? couldn't we have flabbergasted? couldn't you have flabbergasted? couldn't they have flabbergasted?
V-ing perfect
couldn't I have been flabbergasting? couldn't you have been flabbergasting? couldn't he have been flabbergasting? couldn't we have been flabbergasting? couldn't you have been flabbergasting? couldn't they have been flabbergasting?