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