To give the reason of doing something: If you are not having to strain in order to hear what others are saying…, I’m not saying you should take up a musical instrument so that you can hear people better at parties., We clearly need to find a solution so as not to let it get worse., To describe the use or function of something: It’s is used in hospitals now for the relief of pain after an operation., To express the result of an action: Its power to relax us is so strong that it's commonly used in hospital now, The therapy produces such a dramatic improvement that even sceptics were impressed  , There's so much noise that it's difficult to hear the person right next to you,

B2.7 Purpose Devices

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