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