Yes/No Questions and Wh Questions

Although the two-year-old  do not produce auxiliaries, they are able to form negative sentences and questions. During the telegraphic stage of the following sort:

Yes/No Questions                                                             Wh Questions
I ride train?                                                                        What he eat?
Mommy eggnog?                                                              Where Daddy go?
Have some?                                                                       What dat train doing?

These yes/no questions have a rising intonation pattern typical of yes/no questions in English, the child cannot use the particular syntactic device for forming questions in English- auxialiary movemnt.