1 You don't have to/mustn't use emojis when you chat online - it's optional. 2 You mustn't/shouldn't use a dictionary during the exam. It's not allowed. 3 I've got to go - I might/have to be on time for my class. 4 You needn't/mustn't download illegal software. 5 Should/Could you lend me your laptop to write an email? 6 You ought to/would speak more quietly on your phone. 7 I shall/might send Tim an email later, but I'm not sure. 8 Would/Should you like to see my new smartphone? 9 We have to/needn't ask for directions – we can use my phone's GPS to get there. 10 Jane's dad still can't/shouldn't write text messages.
