Should/Have to/Must

To give advice or recommendations  you use   SHOULD and MUST depending on how strong it is.

* Watch this video.

* Listen to 8.4 on page 64 and do exercises 3 and 4. Let me know if you have doubts.

* Listen to 8.5 and do exercise 1 on page 65. 

* Do exercise 2 (mandatory delivery) on page 65.