Things To Know About Essays. Click on a box to match the the idea with the right term. Read the light boxes first. Tools A B An opinion is an arguable position on something. The first reason is expressed by the words, "The main reason is..." Two examples of transitions that introduce proofs are "for example" and "for instance." A supporting reason backs up your opinion with an idea. The proof for each idea is expressed by the facts that back up the idea. An example of a concluding transition is "In summary." An example of taste is "Vanilla ice cream is good." The problem with taste is that only you can know it. It is not an opinion.