I must lactate you must lactate she must lactate we must lactate you must lactate they must lactate
V-ing form
I must be lactating you must be lactating she must be lactating we must be lactating you must be lactating they must be lactating
Perfect
I must have lactated you must have lactated she must have lactated we must have lactated you must have lactated they must have lactated
V-ing perfect
I must have been lactating you must have been lactating she must have been lactating we must have been lactating you must have been lactating they must have been lactating
Negation
Simple form
I mustn't lactate you mustn't lactate she mustn't lactate we mustn't lactate you mustn't lactate they mustn't lactate
V-ing form
I mustn't be lactating you mustn't be lactating she mustn't be lactating we mustn't be lactating you mustn't be lactating they mustn't be lactating
Perfect
I mustn't have lactated you mustn't have lactated she mustn't have lactated we mustn't have lactated you mustn't have lactated they mustn't have lactated
V-ing perfect
I mustn't have been lactating you mustn't have been lactating she mustn't have been lactating we mustn't have been lactating you mustn't have been lactating they mustn't have been lactating
Interrogative form
Simple form
must I lactate? must you lactate? must she lactate? must we lactate? must you lactate? must they lactate?
V-ing form
must I be lactating? must you be lactating? must she be lactating? must we be lactating? must you be lactating? must they be lactating?
Perfect
must I have lactated? must you have lactated? must she have lactated? must we have lactated? must you have lactated? must they have lactated?
V-ing perfect
must I have been lactating? must you have been lactating? must she have been lactating? must we have been lactating? must you have been lactating? must they have been lactating?
Interro-negative form
Simple form
mustn't I lactate? mustn't you lactate? mustn't she lactate? mustn't we lactate? mustn't you lactate? mustn't they lactate?
V-ing form
mustn't I be lactating? mustn't you be lactating? mustn't she be lactating? mustn't we be lactating? mustn't you be lactating? mustn't they be lactating?
Perfect
mustn't I have lactated? mustn't you have lactated? mustn't she have lactated? mustn't we have lactated? mustn't you have lactated? mustn't they have lactated?
V-ing perfect
mustn't I have been lactating? mustn't you have been lactating? mustn't she have been lactating? mustn't we have been lactating? mustn't you have been lactating? mustn't they have been lactating?