I can flicker you can flicker he can flicker we can flicker you can flicker they can flicker
V-ing form
I can be flickering you can be flickering he can be flickering we can be flickering you can be flickering they can be flickering
Perfect
I can have flickered you can have flickered he can have flickered we can have flickered you can have flickered they can have flickered
V-ing perfect
I can have been flickering you can have been flickering he can have been flickering we can have been flickering you can have been flickering they can have been flickering
Negation
Simple form
I cannot flicker you cannot flicker he cannot flicker we cannot flicker you cannot flicker they cannot flicker
V-ing form
I cannot be flickering you cannot be flickering he cannot be flickering we cannot be flickering you cannot be flickering they cannot be flickering
Perfect
I cannot have flickered you cannot have flickered he cannot have flickered we cannot have flickered you cannot have flickered they cannot have flickered
V-ing perfect
I cannot have been flickering you cannot have been flickering he cannot have been flickering we cannot have been flickering you cannot have been flickering they cannot have been flickering
Interrogative form
Simple form
can I flicker? can you flicker? can he flicker? can we flicker? can you flicker? can they flicker?
V-ing form
can I be flickering? can you be flickering? can he be flickering? can we be flickering? can you be flickering? can they be flickering?
Perfect
can I have flickered? can you have flickered? can he have flickered? can we have flickered? can you have flickered? can they have flickered?
V-ing perfect
can I have been flickering? can you have been flickering? can he have been flickering? can we have been flickering? can you have been flickering? can they have been flickering?
Interro-negative form
Simple form
can I not flicker? can you not flicker? can he not flicker? can we not flicker? can you not flicker? can they not flicker?
V-ing form
can I not be flickering? can you not be flickering? can he not be flickering? can we not be flickering? can you not be flickering? can they not be flickering?
Perfect
can I not have flickered? can you not have flickered? can he not have flickered? can we not have flickered? can you not have flickered? can they not have flickered?
V-ing perfect
can I not have been flickering? can you not have been flickering? can he not have been flickering? can we not have been flickering? can you not have been flickering? can they not have been flickering?