假如现在是晚上七点半，请你根据Kate 提供的信息，写一篇短文描述kate一家人此刻的活动情况，六十词左右。
Father Read a book
Mother Clean the room
Grandfather Wash the clothes
Kate Do his homework
Betty Play with the cat
It’s seven o’clock in the evening. Kate’s family are all at home. Kate is doing homework. .Her father is reading a book. Her mother is cleaning the room. Her grandfather is washing the clothes. Betty is her sister. She is playing with the cat. They are all busy.
根据题目提示，本篇短文要用现在进行时态be+v-ing形式。写作步骤如下:
1. 引入话题：It’s seven o’clock in the evening. Kate’s family are all at home.
2. 逐一介绍：Kate is doing homework. .Her father is reading a book. Her mother is cleaning the room. Her grandfather is washing the clothes. Betty is her sister. She is playing with the cat.
3. 结尾：They are all busy.