I can quiver you can quiver he can quiver we can quiver you can quiver they can quiver
V-ing form
I can be quivering you can be quivering he can be quivering we can be quivering you can be quivering they can be quivering
Perfect
I can have quivered you can have quivered he can have quivered we can have quivered you can have quivered they can have quivered
V-ing perfect
I can have been quivering you can have been quivering he can have been quivering we can have been quivering you can have been quivering they can have been quivering
Negation
Simple form
I cannot quiver you cannot quiver he cannot quiver we cannot quiver you cannot quiver they cannot quiver
V-ing form
I cannot be quivering you cannot be quivering he cannot be quivering we cannot be quivering you cannot be quivering they cannot be quivering
Perfect
I cannot have quivered you cannot have quivered he cannot have quivered we cannot have quivered you cannot have quivered they cannot have quivered
V-ing perfect
I cannot have been quivering you cannot have been quivering he cannot have been quivering we cannot have been quivering you cannot have been quivering they cannot have been quivering
Interrogative form
Simple form
can I quiver? can you quiver? can he quiver? can we quiver? can you quiver? can they quiver?
V-ing form
can I be quivering? can you be quivering? can he be quivering? can we be quivering? can you be quivering? can they be quivering?
Perfect
can I have quivered? can you have quivered? can he have quivered? can we have quivered? can you have quivered? can they have quivered?
V-ing perfect
can I have been quivering? can you have been quivering? can he have been quivering? can we have been quivering? can you have been quivering? can they have been quivering?
Interro-negative form
Simple form
can I not quiver? can you not quiver? can he not quiver? can we not quiver? can you not quiver? can they not quiver?
V-ing form
can I not be quivering? can you not be quivering? can he not be quivering? can we not be quivering? can you not be quivering? can they not be quivering?
Perfect
can I not have quivered? can you not have quivered? can he not have quivered? can we not have quivered? can you not have quivered? can they not have quivered?
V-ing perfect
can I not have been quivering? can you not have been quivering? can he not have been quivering? can we not have been quivering? can you not have been quivering? can they not have been quivering?