A good Topic sentence must be a comment (opinion) that makes the author can continue to expand. If a presentation of facts (fact), the author will not be able to write or display information like what?
Topic sentence to express that opinion (opinion) for which the author or narrator can not expand further. If the presentation is the fact (fact) you will not be able to write or anything like it.
Topic sentence good to express (opinion), which makes the author to describe or extend further. If the presentation is a fact (fact), the author cannot write or show any information to another, such as