句型转换。

1. The shirt cost me only 50 yuan.(就画线部分提问)

   ______ ______ ______the shirt cost you?

2. Mr Zhang became an English teacher three yearsago. (改为同义旬)

    Mr Zhang ______ ______ an English teacher______three years.

3. Li Ming did his homework at school yesterday.(改为否定句)

    Li Ming ______ his  homework  atschool yesterday.

4. My brother is the tallest boy in his class. (改为同义句)

    My brother is______than ______student in his class.

5.We can't live if there is no water.(改为同义句)

    We can't live ______.