I must fertilise you must fertilise she must fertilise we must fertilise you must fertilise they must fertilise
V-ing form
I must be fertilising you must be fertilising she must be fertilising we must be fertilising you must be fertilising they must be fertilising
Perfect
I must have fertilised you must have fertilised she 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 she 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 she 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 she 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 she 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 she 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 she fertilise? must we fertilise? must you fertilise? must they fertilise?
V-ing form
must I be fertilising? must you be fertilising? must she be fertilising? must we be fertilising? must you be fertilising? must they be fertilising?
Perfect
must I have fertilised? must you have fertilised? must she 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 she 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 she 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 she 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 she 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 she not have been fertilising? must we not have been fertilising? must you not have been fertilising? must they not have been fertilising?