5. 提出原因

　　There are many reasons for...

　　The answer to this problem involves many factors.

　　Any discussion about this problem would inevitably involve...

　　The first reason that can be obviously seen is...

　　Most people would agree that...

　　Some people may neglect that in fact...

　　Part of the explanation is...

　　On account of this, ...

　　6. 进行对比

　　The advantages of...outweigh the disadvantages of...

　　Although...enjoy(s) a distinct advantage, ...

　　Indeed, ...carry (carries) more weight than...when...is (are) concerned.

　　...maybe..., but it suffers from the disadvantage that...

　　In comparison/contrast, ...

　　7. 引用名言

　　One of the greatest early writers/thinkers said...

　　“...”, such is the remark of...

　　“...” That is how... comment(s)/criticize(s)/praise(s)...

　　“...” How often we hear such words like these.

　　As the saying goes, ...

　　8. 提出假想

　　We can assume...

　　Let’s assume that...

　　Suppose that...

　　Just imagine what would be like if...

　　It is reasonable to expect...

　　It is not surprising that...

　　9. 结尾

　　In summary, ...

　　In short, ...

　　In brief, ...

　　To sum up, ...

　　In conclusion, ...

　　All in all, ...

　　On the whole, ...

　　In a word, ...

　　Thus, it can be concluded that...

　　If all these factors are contemplated, therefore, I think...

　　From what has been discussed above, we may safely draw the conclusion that...

　　Taking account of all these factors, we may reach the conclusion that...

　　We can conclude from the foregoing reasons and examples that...

　　Now, after close examination, it is not difficult to draw the conclusion that...