Vanderwende (2008) point out that learning to ask good questions is an important task in NLP research in its own right, and should consist of more than the syntactic transformation of a declarative sentence.
a natural sounding question often compresses the sentence on which it is based (e.g., question 3 in Figure 1), uses synonyms for terms in the passage (e.g., "form" for "produce" in question 2 and "get" for "produce" in question 3), or refers to entities from preceding sentences or clauses (e.g., the use of "photosynthesis" in question 2).