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