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