English verb conjugation
MUST DESTABILISE

Regular verb: destabilise - destabilised - destabilised

Affirmation

Simple form	V-ing form
I must destabilise you must destabilise he must destabilise we must destabilise you must destabilise they must destabilise	I must be destabilising you must be destabilising he must be destabilising we must be destabilising you must be destabilising they must be destabilising
Perfect	V-ing perfect
I must have destabilised you must have destabilised he must have destabilised we must have destabilised you must have destabilised they must have destabilised	I must have been destabilising you must have been destabilising he must have been destabilising we must have been destabilising you must have been destabilising they must have been destabilising

Negation

Simple form	V-ing form
I mustn't destabilise you mustn't destabilise he mustn't destabilise we mustn't destabilise you mustn't destabilise they mustn't destabilise	I mustn't be destabilising you mustn't be destabilising he mustn't be destabilising we mustn't be destabilising you mustn't be destabilising they mustn't be destabilising
Perfect	V-ing perfect
I mustn't have destabilised you mustn't have destabilised he mustn't have destabilised we mustn't have destabilised you mustn't have destabilised they mustn't have destabilised	I mustn't have been destabilising you mustn't have been destabilising he mustn't have been destabilising we mustn't have been destabilising you mustn't have been destabilising they mustn't have been destabilising

Interrogative form

Simple form	V-ing form
must I destabilise? must you destabilise? must he destabilise? must we destabilise? must you destabilise? must they destabilise?	must I be destabilising? must you be destabilising? must he be destabilising? must we be destabilising? must you be destabilising? must they be destabilising?
Perfect	V-ing perfect
must I have destabilised? must you have destabilised? must he have destabilised? must we have destabilised? must you have destabilised? must they have destabilised?	must I have been destabilising? must you have been destabilising? must he have been destabilising? must we have been destabilising? must you have been destabilising? must they have been destabilising?

Interro-negative form

Simple form	V-ing form
mustn't I destabilise? mustn't you destabilise? mustn't he destabilise? mustn't we destabilise? mustn't you destabilise? mustn't they destabilise?	mustn't I be destabilising? mustn't you be destabilising? mustn't he be destabilising? mustn't we be destabilising? mustn't you be destabilising? mustn't they be destabilising?
Perfect	V-ing perfect
mustn't I have destabilised? mustn't you have destabilised? mustn't he have destabilised? mustn't we have destabilised? mustn't you have destabilised? mustn't they have destabilised?	mustn't I have been destabilising? mustn't you have been destabilising? mustn't he have been destabilising? mustn't we have been destabilising? mustn't you have been destabilising? mustn't they have been destabilising?