Here, we use the dependency representations proposed in (NLP Toolkit 2011) to describe our method. As shown in Figure 2, a dependency tree composes of some contiguous words in a sentence. Every word in sentence can be viewed as a node of tree. Two nodes holding a dependency relation constitute a dependency pair, in which one node is the head (e.g. “criticize”) while the other is a dependent (e.g. “student”). A dependency relation is represented by a directed arc pointing from the head to the dependent with a functional category label (e.g. “SBV”). So, a dependent can be viewed as