I must fertilise you must fertilise he must fertilise we must fertilise you must fertilise they must fertilise
V-ing form
I must be fertilising you must be fertilising he must be fertilising we must be fertilising you must be fertilising they must be fertilising
Perfect
I must have fertilised you must have fertilised he must have fertilised we must have fertilised you must have fertilised they must have fertilised
V-ing perfect
I must have been fertilising you must have been fertilising he must have been fertilising we must have been fertilising you must have been fertilising they must have been fertilising
Negation
Simple form
I must not fertilise you must not fertilise he must not fertilise we must not fertilise you must not fertilise they must not fertilise
V-ing form
I must not be fertilising you must not be fertilising he must not be fertilising we must not be fertilising you must not be fertilising they must not be fertilising
Perfect
I must not have fertilised you must not have fertilised he must not have fertilised we must not have fertilised you must not have fertilised they must not have fertilised
V-ing perfect
I must not have been fertilising you must not have been fertilising he must not have been fertilising we must not have been fertilising you must not have been fertilising they must not have been fertilising
Interrogative form
Simple form
must I fertilise? must you fertilise? must he fertilise? must we fertilise? must you fertilise? must they fertilise?
V-ing form
must I be fertilising? must you be fertilising? must he be fertilising? must we be fertilising? must you be fertilising? must they be fertilising?
Perfect
must I have fertilised? must you have fertilised? must he have fertilised? must we have fertilised? must you have fertilised? must they have fertilised?
V-ing perfect
must I have been fertilising? must you have been fertilising? must he have been fertilising? must we have been fertilising? must you have been fertilising? must they have been fertilising?
Interro-negative form
Simple form
must I not fertilise? must you not fertilise? must he not fertilise? must we not fertilise? must you not fertilise? must they not fertilise?
V-ing form
must I not be fertilising? must you not be fertilising? must he not be fertilising? must we not be fertilising? must you not be fertilising? must they not be fertilising?
Perfect
must I not have fertilised? must you not have fertilised? must he not have fertilised? must we not have fertilised? must you not have fertilised? must they not have fertilised?
V-ing perfect
must I not have been fertilising? must you not have been fertilising? must he not have been fertilising? must we not have been fertilising? must you not have been fertilising? must they not have been fertilising?