diff --git a/Senseval_Prep/senseval_preprocessing.py b/Senseval_Prep/senseval_preprocessing.py
index 4389e11e96c129eb54a22bcbbd0da5a2fc9992c6..c24bf891bb74b5f6ee22c25eef5f32c60a7fcce7 100644
--- a/Senseval_Prep/senseval_preprocessing.py
+++ b/Senseval_Prep/senseval_preprocessing.py
@@ -29,6 +29,9 @@ def get_stopword_list(stop_path):
         stopli = []
         for line in f:
             stopli.append(line[:-1])
+        stopli.append("n't")
+        stopli.append("'m")
+        stopli.append("whether")
         return stopli
 
 def get_infos(tree_path):