I must depressurise you must depressurise he must depressurise we must depressurise you must depressurise they must depressurise
V-ing form
I must be depressurising you must be depressurising he must be depressurising we must be depressurising you must be depressurising they must be depressurising
Perfect
I must have depressurised you must have depressurised he must have depressurised we must have depressurised you must have depressurised they must have depressurised
V-ing perfect
I must have been depressurising you must have been depressurising he must have been depressurising we must have been depressurising you must have been depressurising they must have been depressurising
Negation
Simple form
I mustn't depressurise you mustn't depressurise he mustn't depressurise we mustn't depressurise you mustn't depressurise they mustn't depressurise
V-ing form
I mustn't be depressurising you mustn't be depressurising he mustn't be depressurising we mustn't be depressurising you mustn't be depressurising they mustn't be depressurising
Perfect
I mustn't have depressurised you mustn't have depressurised he mustn't have depressurised we mustn't have depressurised you mustn't have depressurised they mustn't have depressurised
V-ing perfect
I mustn't have been depressurising you mustn't have been depressurising he mustn't have been depressurising we mustn't have been depressurising you mustn't have been depressurising they mustn't have been depressurising
Interrogative form
Simple form
must I depressurise? must you depressurise? must he depressurise? must we depressurise? must you depressurise? must they depressurise?
V-ing form
must I be depressurising? must you be depressurising? must he be depressurising? must we be depressurising? must you be depressurising? must they be depressurising?
Perfect
must I have depressurised? must you have depressurised? must he have depressurised? must we have depressurised? must you have depressurised? must they have depressurised?
V-ing perfect
must I have been depressurising? must you have been depressurising? must he have been depressurising? must we have been depressurising? must you have been depressurising? must they have been depressurising?
Interro-negative form
Simple form
mustn't I depressurise? mustn't you depressurise? mustn't he depressurise? mustn't we depressurise? mustn't you depressurise? mustn't they depressurise?
V-ing form
mustn't I be depressurising? mustn't you be depressurising? mustn't he be depressurising? mustn't we be depressurising? mustn't you be depressurising? mustn't they be depressurising?
Perfect
mustn't I have depressurised? mustn't you have depressurised? mustn't he have depressurised? mustn't we have depressurised? mustn't you have depressurised? mustn't they have depressurised?
V-ing perfect
mustn't I have been depressurising? mustn't you have been depressurising? mustn't he have been depressurising? mustn't we have been depressurising? mustn't you have been depressurising? mustn't they have been depressurising?