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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]
Neverthinkyouwillneverbedetected,whenyouwanttotellalie.Thechancesare,soonerorlater,yourliewittbefoundoutanditwillthenexposeyoutoshame.
Tellingalieismorallywrong.Besides,therearemanydisadvantageslyinginthewayofaliar.First,hehastohaveagoodmemory,lesthecontradictsatoimewhathesaidinanother.Second,heisalwaysannoyedbyhisconscience,becauseheisinconstantfearthathisfalsehoodmaybefoundout.Third,aliarisnevertrustedandrespectedbyothers.Theresultmaybethathiswords,evenwhenhespeaksthetruth,arenotbelieved.Fourthandthelast,onceapersonhastoldalie,hecannothelptellinganotherinordertoconcealthefirst,andthenathirdandafourth,untillyingbeesahabit.Afterthat,hemaysaysomethinguntrueevenwhenhewishestospeakthetruth.
Thedisadvantagesresultingfromtellingaliearetoomanytobelisted.Theabovearejustsomeoftheobviousones.Ifyouwanttobefreefromtheseannoyances,ifyouwanttobeatrustworthyperson,nevertellalie.