1. 调查结果没有证据申明

　　To begin with, the argument depends on the assumption that… (阐述说出了一个没有根据的申明，并说出文中的原因) —rather than for some other reasons. Yet it is entirely possible that… (说明这种猜测可能的原因) or some other factor. Without ruling out all other reasons why… (重述这个申明)…(说出反方向的结论).

　　2. 提到了样本，但是数据不具有代表性(数据不够)

　　Firstly, the author provides no evidence that the survey is statistically reliable. Perhaps the survey’s sample is not sufficient in size or representative of the quality of …(说明对象的数量和质量不够) For that matter, this survey is not strong enough to establish causation between… (在这里列出原因和结果，做比较) However, the other reasons of the survey which (叙述其他原因下的情况). As a result, without the evidence that the survey is statistically reliable the author cannot justifiably draw any conclusion by relying on this survey.

　　3. 猜测，但是没有证据

　　Thirdly, the argument assumes that… (阐述文中的猜测) However, the letter provides no evidence to substantiate this assumption. In fact, the letter suggests that this might be the case. By admitting that …, the letter implies that …说明影响他们happy的因素还有其他的方面，不光是研究中所列举