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