Consider the following sentence: (1) The children walked a…

Consider the following sentence: (1) The children walked along the shore. Examples (2-3) show the results of some constituency tests. What do these results imply about the structure of sentence (1)? (2) *The children walked along the shore, and the adults did so the street. (3) *The children said they would walk along the shore, and walk along they did the shore.