You ___ wear a helmet when you ride a bike., must, I ___ swim very well when I was five years old. (X)), couldn´t, We ___ talk in the library because people are studying., mustn´t, She ___ help you with your homework tomorrow., can, You ___ eat too much sugar; it’s bad for your teeth., shouldn´t, He ___ play the piano, but he can play the guitar., can´t, Students ___ arrive on time for class., must, You ___ use your phone during the exam., mustn´t, I ___ understand the exercise yesterday; it was too difficult., couldn´t, We ___ go to the park if it stops raining., can, You ___ be polite to your teachers., must, She ___ lift the box because it was very heavy., couldn´t, They ___ watch TV after finishing their homework., can, You ___ forget your homework at home., mustn´t, He ___ run very fast when he was younger. (V), could, You ___ shout in class., mustn´t, We ___ see the mountains from here on a clear day., can, You ___ eat more fruit and vegetables., should, She ___ come to the party because she was ill., couldn´t, You ___ listen carefully to the instructions., must.

Modals (can, must, could)

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