There are two particles for asking questions in Chinese - 呢 and 吗.
呢 is used for turning statements into queries. For example:
你几岁呢?你在哪里呢?
吗 is used for turning statements into yes or no questions. For example:
你可以听到我吗?你看得到吗?
Let's practice what we have learnt.
Fill in the blank.
你吃了 吗?
Fill in the blank.
你吃什么 呢?