句型转换。 1. Helen's birthday is on November 26th. (对画线部分提问) ______ ______ Helen's birthday? 2. They have a School Day in June.(改为一般疑问句) ______ they ______ a School Day in June? 3. The Chinese speech contest is September 7th.(改为否定句) The Chinese speech contest______ ______ September 7th. 4. Her date of birth is March 16th.(改为同义句) ______ ______ is March 16th. 5. My sister is nine years old. (对画线部分提问) ______ ______ is your sister?