1 A: Could/Must | use your phone please? B: Yes, you can/might.
2 A: Should/Would you like to have a Skype chat with me on Saturday? B: | can't/shouldn’t, I'm busy on Saturday.
3 A: I've tried everything but | shouldn’t/can’t connect my smartphone to the Internet. B: You need to/shall ask a waiter for the password.
4 A: Must/Would you help me install my printer this evening? B: Sorry, but | have to/could mind my little sister tonight. ‘
5 A: Why hasn't Steve called us yet? He could/ ought to be in trouble. B: You can’t/shouldn’t worry so much! His phone shall/might just be out of battery.
6 A: Shall/Would | install the software on your laptop? B: No, you needn’t/mustn’t do that. | doubt I'd use it.
7 A: Your phone is so old, Ann. You really may/ should get a new one. B: | know. | want one that can/must connect to the Internet.
8 A: Could/Might anyone show me how to use this app? B: | can/must help you if you like.
2) would, can’t
3) can’t, need to
4) would, have to
5) could, shouldn’t, might
6) shall, needn’t
7) should , can
8) could , can