Analyze the differences between the object position in the following sentences and modern Chinese, and summarize the usage of prepositional objects in classical Chinese.

In short, the prepositional object sentences in ancient Chinese are generally divided into two categories: 1. In interrogative sentences, pronouns should be preceded by objects. 2. In negative sentences, pronouns should be preceded by objects.

In the examples, the first and second examples belong to the first type, and the third and fourth examples belong to the second type.

In addition, objects can be divided into verbs and prepositions. The first sentence is an object with verbs, and the second sentence is an object with prepositions.

The above is typical, and there are other types of prepositional objects, so I won't repeat them.