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