I must prefertilise you must prefertilise he must prefertilise we must prefertilise you must prefertilise they must prefertilise
V-ing form
I must be prefertilising you must be prefertilising he must be prefertilising we must be prefertilising you must be prefertilising they must be prefertilising
Perfect
I must have prefertilised you must have prefertilised he must have prefertilised we must have prefertilised you must have prefertilised they must have prefertilised
V-ing perfect
I must have been prefertilising you must have been prefertilising he must have been prefertilising we must have been prefertilising you must have been prefertilising they must have been prefertilising
Negation
Simple form
I must not prefertilise you must not prefertilise he must not prefertilise we must not prefertilise you must not prefertilise they must not prefertilise
V-ing form
I must not be prefertilising you must not be prefertilising he must not be prefertilising we must not be prefertilising you must not be prefertilising they must not be prefertilising
Perfect
I must not have prefertilised you must not have prefertilised he must not have prefertilised we must not have prefertilised you must not have prefertilised they must not have prefertilised
V-ing perfect
I must not have been prefertilising you must not have been prefertilising he must not have been prefertilising we must not have been prefertilising you must not have been prefertilising they must not have been prefertilising
Interrogative form
Simple form
must I prefertilise? must you prefertilise? must he prefertilise? must we prefertilise? must you prefertilise? must they prefertilise?
V-ing form
must I be prefertilising? must you be prefertilising? must he be prefertilising? must we be prefertilising? must you be prefertilising? must they be prefertilising?
Perfect
must I have prefertilised? must you have prefertilised? must he have prefertilised? must we have prefertilised? must you have prefertilised? must they have prefertilised?
V-ing perfect
must I have been prefertilising? must you have been prefertilising? must he have been prefertilising? must we have been prefertilising? must you have been prefertilising? must they have been prefertilising?
Interro-negative form
Simple form
must I not prefertilise? must you not prefertilise? must he not prefertilise? must we not prefertilise? must you not prefertilise? must they not prefertilise?
V-ing form
must I not be prefertilising? must you not be prefertilising? must he not be prefertilising? must we not be prefertilising? must you not be prefertilising? must they not be prefertilising?
Perfect
must I not have prefertilised? must you not have prefertilised? must he not have prefertilised? must we not have prefertilised? must you not have prefertilised? must they not have prefertilised?
V-ing perfect
must I not have been prefertilising? must you not have been prefertilising? must he not have been prefertilising? must we not have been prefertilising? must you not have been prefertilising? must they not have been prefertilising?