Word order (词序）is important in Chinese. With the same words, if you put them in different orders, you convey totally different meanings. Here are some examples.
1. 我喜欢她。I like her, but she may not like me. -:(
2. 她喜欢我。 She likes me, but … you know.
1. 他跳上桌子。He jumped onto the table. This sentence emphasize the action that he jumped onto the table. I use past simple to indicate that the action has been done.
2.他在座子上跳。He is dancing on the table. This sentence has a total different structure, you will learn more in ensuing chapters.
Rule No.1: Always pay attention to the word order.