Task: Question Answering
Input (English): In order to find the object type, SimplerVoice, first, builds an ontology-based knowledge tree. We propose to use 2 methods to generate the suitable verbs for the target object: heuristics-based, and n-grams model. 
 Question: Which model do they use to generate key messages?
Output (English): ontology-based knowledge tree heuristics-based n-grams model