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 must not lactate you must not lactate she must not lactate we must not lactate you must not lactate they must not lactate
V-ing form
I must not be lactating you must not be lactating she must not be lactating we must not be lactating you must not be lactating they must not be lactating
Perfect
I must not have lactated you must not have lactated she must not have lactated we must not have lactated you must not have lactated they must not have lactated
V-ing perfect
I must not have been lactating you must not have been lactating she must not have been lactating we must not have been lactating you must not have been lactating they must not 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
must I not lactate? must you not lactate? must she not lactate? must we not lactate? must you not lactate? must they not lactate?
V-ing form
must I not be lactating? must you not be lactating? must she not be lactating? must we not be lactating? must you not be lactating? must they not be lactating?
Perfect
must I not have lactated? must you not have lactated? must she not have lactated? must we not have lactated? must you not have lactated? must they not have lactated?
V-ing perfect
must I not have been lactating? must you not have been lactating? must she not have been lactating? must we not have been lactating? must you not have been lactating? must they not have been lactating?