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