1．撒谎的危害；
2．我的忠告。
[写作导航]第一段引入话题，指出谎言总有被揭穿的时候，警告人们不要撒谎；第二段指出撒谎的危害，可用罗列法，列出诸如：不道德、良心受谴责、不被人信任和尊重、会养成撒谎的习惯等；第三段收尾，指出要想没有撒谎的烦恼，就永远不要撒谎。
[范文]
Never think you will never be detected, when you want to tell a lie. The chances are, sooner or later, your lie witt be found out and it will then expose you to shame.
Telling a lie is morally wrong. Besides, there are many disadvantages lying in the way of a liar. First, he has to have a good memory, lest he contradicts at one time what he said in another. Second, he is always annoyed by his conscience, because he is in constant fear that his falsehood may be found out. Third, a liar is never trusted and respected by others. The result may be that his words, even when he speaks the truth, are not believed. Fourth and the last, once a person has told a lie, he cannot help telling another in order to conceal the first, and then a third and a fourth, until lying becomes ahabit. After that, he may say something untrue even when he wishes to speak the truth.
The disadvantages resulting from telling a lie are too many to be listed. The above are just some of the obvious ones. If you want to be free from these annoyances, if you want to be a trustworthy person, never tell a lie.