A couch potato 指空闲时间总坐在沙发上看电视或手机、几乎不活动的人。它带有幽默感，也有一点批评意味。这个习语偏口语；讨论健康的作文中，可写 people with a sedentary lifestyle。
什么情境适合说 a couch potato？
写一句英语，检查习语是否适合当前情境，以及哪里需要修改。
本次检查比平时稍久，完成后反馈会自动显示在这里。
be / become / turn into + a couch potato; couch potatoes
- In winter I turn into a couch potato and watch TV series every evening.
- My flatmate is a real couch potato; he hasn't left the sofa all weekend.
- Children who become couch potatoes often find it hard to get enough exercise.
修改原因
修改前At weekends my brother is a sofa potato.
修改后At weekends my brother is a couch potato.
Sofa 确实是英式英语中称呼这种家具的常用词，因此容易产生这个错误。但习语的形式固定，使用 couch。修改只换了一个词。
Lazy 泛指不愿付出努力，工作和学习中也可以这样形容人。Couch potato 则具体涉及闲暇时在屏幕前久坐：He works hard all week, but at weekends he's a couch potato。只想说某人喜欢待在家里，美式英语可以用 homebody。
动手练习
Since he bought a big new TV, Jake has become a real ___: he hardly ever goes out.
查看答案
couch potato — Jake 几乎不出门，总坐在新电视前，所以是 couch potato。A social butterfly 则喜欢与人交往，很少一直待在家里。
描述一个你完全窝在沙发上度过的日子。说明看了什么，以及在沙发上待了多少小时。
Last Sunday I was a complete couch potato: I spent eight hours on the sofa watching a crime series.
练习把新词用准确
用正在学的词造句。LetsWords 检查用法和语法，提供修改与母语解释，再通过复习巩固。