填空

① I ___ buy some new clothes. Mine look so old. 

② I ___ buy some new clothes. I'm starting a new job as a teacher and we have to wear formal clothes.

I must buy some new clothes. Mine look so old. 
我必须买一些新衣服。我的衣服看起来太旧了。
I've got to / I have to buy some new clothes. I'm starting a new job as a teacher and we have to wear formal clothes.
我得买些新衣服。我要开始一份教师的新工作，我们必须穿正装。
formal clothes 正装，正式的服装
formal 正式的，正规的，适合正式场合的

need to
必须，需要

I need to go to the toilet.
我（需）要去一下洗手间。

She needs to go to the doctor. She gets headaches every day.
她需要去看医生。她每天都头疼。
headache(s) 头痛

Need to 变疑问句需要使用助动词 do 或 does：
Do you need to pass an exam to get into university?
你需要通过考试才能进入大学吗？

Does she need to get a job?
她需要找工作吗？