Polly Lingual
义务
Obligations
开始上课
刽子手
词汇
Vocabulary
have to
must
短语
Phrases
You must stop.
Related Lessons
问候
Greetings
你好吗？
How Are You?
Food II
祈使语气
Imperative Mood
To Have
课程
Courses
初级
Beginner
语法
Grammar
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