I must breast-feed you must breast-feed he must breast-feed we must breast-feed you must breast-feed they must breast-feed
V-ing form
I must be breast-feeding you must be breast-feeding he must be breast-feeding we must be breast-feeding you must be breast-feeding they must be breast-feeding
Perfect
I must have breast-fed you must have breast-fed he must have breast-fed we must have breast-fed you must have breast-fed they must have breast-fed
V-ing perfect
I must have been breast-feeding you must have been breast-feeding he must have been breast-feeding we must have been breast-feeding you must have been breast-feeding they must have been breast-feeding
Negation
Simple form
I mustn't breast-feed you mustn't breast-feed he mustn't breast-feed we mustn't breast-feed you mustn't breast-feed they mustn't breast-feed
V-ing form
I mustn't be breast-feeding you mustn't be breast-feeding he mustn't be breast-feeding we mustn't be breast-feeding you mustn't be breast-feeding they mustn't be breast-feeding
Perfect
I mustn't have breast-fed you mustn't have breast-fed he mustn't have breast-fed we mustn't have breast-fed you mustn't have breast-fed they mustn't have breast-fed
V-ing perfect
I mustn't have been breast-feeding you mustn't have been breast-feeding he mustn't have been breast-feeding we mustn't have been breast-feeding you mustn't have been breast-feeding they mustn't have been breast-feeding
Interrogative form
Simple form
must I breast-feed? must you breast-feed? must he breast-feed? must we breast-feed? must you breast-feed? must they breast-feed?
V-ing form
must I be breast-feeding? must you be breast-feeding? must he be breast-feeding? must we be breast-feeding? must you be breast-feeding? must they be breast-feeding?
Perfect
must I have breast-fed? must you have breast-fed? must he have breast-fed? must we have breast-fed? must you have breast-fed? must they have breast-fed?
V-ing perfect
must I have been breast-feeding? must you have been breast-feeding? must he have been breast-feeding? must we have been breast-feeding? must you have been breast-feeding? must they have been breast-feeding?
Interro-negative form
Simple form
mustn't I breast-feed? mustn't you breast-feed? mustn't he breast-feed? mustn't we breast-feed? mustn't you breast-feed? mustn't they breast-feed?
V-ing form
mustn't I be breast-feeding? mustn't you be breast-feeding? mustn't he be breast-feeding? mustn't we be breast-feeding? mustn't you be breast-feeding? mustn't they be breast-feeding?
Perfect
mustn't I have breast-fed? mustn't you have breast-fed? mustn't he have breast-fed? mustn't we have breast-fed? mustn't you have breast-fed? mustn't they have breast-fed?
V-ing perfect
mustn't I have been breast-feeding? mustn't you have been breast-feeding? mustn't he have been breast-feeding? mustn't we have been breast-feeding? mustn't you have been breast-feeding? mustn't they have been breast-feeding?