We are learning to use modal verbs in persuasion.
You must come and see Kensuke’s cave because it is very dark, gloomy and scary. If you say something it echoes. You have to come and see the blue sea, it has lots of fish. You shall come and see this glittering warm sand, lots of people are there and lots of people will be swimming in and out. You ought come and see these red bananas, you will be amazed because they are so delicious. Have a look at the people swimming in and out the massive waves. Come and drink the lovely coconut milk. I can smell the salty water. I can see the waves dashing on the super soft sand. Come to Kensuke’s Marvellous Kingdom