Hey there!
Let's start unit 8C about mobile apps. Do exercises 1, 2, 3, 4 and 6 (check your answers here). You also need to do the grammar activities on page 127 on modal verbs of obligation and advice (check answers here). It's very easy and I'm sure you already use all of them. Just a reminder:
- Obligation we use: 'have to' (external obligations, rules, laws) and 'must' (personal obligations, things we believe are necessary or important)
- No obligation we use: 'don't have to'.
- Prohibition we use: 'mustn't'.
- Advice we use: 'should' and 'shouldn't'.
Of course if you need some extra practice on this grammar point, there are plenty of online exercises:
- Perfect English
- Test English
We'll see if you have doubts on our next online class. Have a nice practice!
- Perfect English
- Test English
We'll see if you have doubts on our next online class. Have a nice practice!