吗 ma is used to form simple questions which can be answered with yes or no.
In order to form a question with 吗 ma (= particle), 吗 ma is simply added at the end of a statement.
Structure of a Statement
| 中 | 国 | 很 | 大 | 。 |
| zhōng | guó | hěn | dà | _ |
| middle | country | very | big | _ |
| China | very, quite | big, old, main | 。 | |
| China is big. | ||||
Structure of a Question
| 中 | 国 | 很 | 大 | 吗 | ？ |
| zhōng | guó | hěn | dà | ma | _ |
| middle | country | very | big | particle | _ |
| China | very, quite | big, old, main | particle | ？ | |
| Is China big? | |||||