Learners often use would and must instead of should. Lots of people think that animals should be free. X Lots of people think that animals must be free. For each pair of sentences tick the correct one. 1 A 2 A Your computer is very slow. I think you should upgrade your system. Your computer is very slow. I think you must upgrade your system. Sally wouldn't have emigrated if she hadn't been unhappy here. 8 Sally shouldn't have emigrated if she hadn't been unhappy here. Our teachers should motivate us to study more so we do better in exams. Our teachers would motivate us to study more so we do better in exams. We should launch the new product before the end of the month or we​