吗？，呢？
In Chinese, we usually add 吗 to a statement or even a single word to make a simple question(with “yes/no” answers), and you will get a positive or negative response, for example:
A：你是学生吗？
B：我不是。
Sentences structure:
- Subject+verb+(object+)吗？
eg. Is she a student?/她是学生吗？，
Do you learn Chinese?/你学中文吗？
Do you know?/你知道吗？
- Verb/Ajective+(Object+)吗？
eg. Is it ok/好吗？，可以吗？，行吗？
Have you eaten?/吃饭了吗？
Are you hungry?/饿吗？
呢 usually means what about?/how about, sometimes, 呢 is used to emphasize surprise and doubt, for example:
How about her?/她呢？
She is Chinese, what about you?/她是中国人，你呢？
but she agreed my advice, why?/但是她同意了我的建议呢，为什么？。
let’s look at another example, can you tell the difference?:
他爸爸是老师吗？,他妈妈呢？
Sentences structure：Subject+呢？