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