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Contributions of various features in our best closed system (closed-3): decrease in precision/recall/F-measure by leaving one feature at a time.
| Feature | P | R | F |
| Orthographic Feature | 27.1 | 42.5 | 33.2 |
| POS | 23.7 | 31.1 | 26.8 |
| Surface Word | 12.2 | 8.1 | 10.1 |
| Trigger Word | 2.4 | 1.6 | 1.9 |
| Morphological Pattern | 1.3 | 1.0 | 1.1 |
