The pattern introduced by the conjunction Youyu (for) and the pattern introduced by Yin-wei (because) are causal sentence patterns and they belong to the direct reasoning in logic. The author does not agree with the view that the pattern introduced by Youyu is used to express something unpleasant in terms of emotional preference. The author thinks that the difference between the two lies in the expression of reasoning intention of the speaker. The pattern introduced by Youyu analyzes the cause of the problem and emphasizes the basis of reasoning while the pattern introduced by Yimvei indicates...
