Emma taught the children English.
Jane is reading a storybook.
I heard him singing in the hall.
David became an engineer.
A项为主语+谓语+直接宾语+间接宾语（S+V+O1+O2）结构的简单句。B项结构为主语+谓语+宾语（S+V+O）；C项结构为主语+谓语+宾语+宾补（S+V+O+C）；D项结构为主语+系动词+表语（S+V+P）。
