On the methods of analysing sentences, this thesis employs the Ranked Constituent Analysis of Halliday's theory to avoid the disadvantages of the Immediate Constituent Analysis which has still been widely applied today. 在析句方法上,本文认为目前通行的直接成分分析法析句时具有明显的局限性,并引入韩礼德的级阶成分分析法以避免直接成分分析法析句的不足之处。