1、引出不同观点：People’s views on…vary from person to person. Some hold that … however, others believe that …人们对 … 的观点因人而异。有些人认为… ，然而其他人却认为…

　　2、结尾：Taking all these factors into consideration, we naturally come to the conclusion that…把所有这些因素加以考虑，我们自然会得出结论…

　　3、 That iswhy +句子那是.. .的原因。

　　4、 That is because +句子那是因为...

　　5、It goes without saying that +句子不言而喻，毫无疑问。

　　6、 There is no need to do没必要做...

　　7、 There is no point in doing做某事毫无意义。

　　8、 had better (not) do最好不)做。