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