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