4. The method of claim 1 , wherein step 2 further comprises: Step 2.1: For each sentence, using multiple parsing models to produce several parse trees; and Step 2.2: For each predicate, performing monolingual SRL multiple times to obtain several argument candidates, each time using one parse tree generated in Step 2.1.
4. The method of claim 1 , wherein step 2 further comprises: Step 2.1: For each sentence, using multiple parsing models to produce several parse trees; and Step 2.2: For each predicate, performing monolingual SRL multiple times to obtain several argument candidates, each time using one parse tree generated in Step 2.1. 5. The method of claim 4 , wherein in Step 2.1, multiple parsing models are chosen to be different open-source parsers, including Berkeley parser, Bikel parser and Stanford parser.