Making your point can be challenging, especially when many words are commonly confused. For example, in English, ensure, insure and assure are three words people often interchange - but the correct usage depends on the context. These tips will ensure you don't misuse them:
ENSURE is something you do to guarantee an event or condition: Jacklin made enough food to ensure that her guests wouldn't be hungry - Way to remember, the word ensure has two e's in it - just like guarantee
INSURE primarily means protecting against financial liability: Virginia insured her new car against damages. Think of the word insurance, which also deals with protecting finances.
ASSURE is something you do to people or animals to comfort or convince them: Alice assured Nick that his speech went well. You only assure things that are alive, which starts with an "a" - just like assure.
Source: Toastmasters Magazine, September 2012