Must, Mustn´t, Needn´t, It´s illegal

This worksheet deals with the modals must, mustn´t, and needn´t as they imply obligation, proihibition, and lack of necessity respectively. It begins with a brief explanation of these modals, and then an exercise for filling in the gaps. The second exercises is based on "company rules". So students should write an X according the their job rules. After that, they should form sentences according to such rules using the modals.