作业精灵老师示例：
S1：What is Mrs Brown doing now？
S2：She is washing clothes.
S1：What is Mr Brown doing now？
S2：He is playing the computer.
S1：What is Helen doing now？
S2：She is reading a storybook.
S1：What is Mike doing now？
S2：He is washing the dishes.
S1：What is Tim doing now？
S2：He is playing computer games.
