I must peer you must peer she must peer we must peer you must peer they must peer
V-ing form
I must be peering you must be peering she must be peering we must be peering you must be peering they must be peering
Perfect
I must have peered you must have peered she must have peered we must have peered you must have peered they must have peered
V-ing perfect
I must have been peering you must have been peering she must have been peering we must have been peering you must have been peering they must have been peering
Negation
Simple form
I mustn't peer you mustn't peer she mustn't peer we mustn't peer you mustn't peer they mustn't peer
V-ing form
I mustn't be peering you mustn't be peering she mustn't be peering we mustn't be peering you mustn't be peering they mustn't be peering
Perfect
I mustn't have peered you mustn't have peered she mustn't have peered we mustn't have peered you mustn't have peered they mustn't have peered
V-ing perfect
I mustn't have been peering you mustn't have been peering she mustn't have been peering we mustn't have been peering you mustn't have been peering they mustn't have been peering
Interrogative form
Simple form
must I peer? must you peer? must she peer? must we peer? must you peer? must they peer?
V-ing form
must I be peering? must you be peering? must she be peering? must we be peering? must you be peering? must they be peering?
Perfect
must I have peered? must you have peered? must she have peered? must we have peered? must you have peered? must they have peered?
V-ing perfect
must I have been peering? must you have been peering? must she have been peering? must we have been peering? must you have been peering? must they have been peering?
Interro-negative form
Simple form
mustn't I peer? mustn't you peer? mustn't she peer? mustn't we peer? mustn't you peer? mustn't they peer?
V-ing form
mustn't I be peering? mustn't you be peering? mustn't she be peering? mustn't we be peering? mustn't you be peering? mustn't they be peering?
Perfect
mustn't I have peered? mustn't you have peered? mustn't she have peered? mustn't we have peered? mustn't you have peered? mustn't they have peered?
V-ing perfect
mustn't I have been peering? mustn't you have been peering? mustn't she have been peering? mustn't we have been peering? mustn't you have been peering? mustn't they have been peering?