This is true. A thesis statement is you opinion. This means that not everyone will agree with your opinion. For example:
Smoking should be illegal because it is unhealthy, costly, and an annoyance.
Though you supported your opinion, someone who enjoys smoking may say that it is not costly or annoying. This is why a thesis statement is controversial.
The perfect form is the verb tense used to indicate a completed, or "perfected," action or condition. Verbs can appear in any one of three perfect tenses: presentperfect, past perfect, and future perfect. Verbs in the perfect form use a form of "have" or "had" + the past participle
