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Grammar 2 1. Please know a little about DIY. You should know a little about DIY. We use ‘should’ and ‘had better’ when giving advice and telling people what is the best or right thing to do. You had better know a little about DIY. 2. Please put in a brighter light in the room. You should put in a brighter light in the room. We use ‘should’ and ‘had better’ when giving advice and telling people what is t