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