In this video Linda explains the differences between "assure", "insure" and "ensure". They not only sound similar, but those three words also make an outcome sure but they are in no way interchangeable. "Assure" is used to speak out a promise or say something with confidence, for example "I assure you that he is a great lawyer". "Ensure" is used to make something certain, such as here: "Please ensure that you will be home at five o'clock today"."Insure" means to protect an object against risk by buying an insurance policy from an insurance company, like here: "I insure my television because it was expensive". Once you have realized the three different meanings and usages, there is no way you'll confuse them again.
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