The nominative case should be placed in the subject position and the accusative case in the object position. The position of the subject is known, usually at the beginning of the sentence, such as I am a teacher. In English, the object has two positions, one after the verb and the other after the object. Note that not all verbs need to follow the object.
The other is after prepositions, such as: 1, I gave him a book. Here give is a verb and his is the object of give (the function of the object is to make the meaning expressed by the predicate complete and clear). Because his position is the object, if you use personal pronouns in this position, you have to use the accusative rather than the nominative him.
Extended data:
Personal pronouns refer to pronouns that directly refer to people or things. There are many personal pronouns in ancient Chinese, and their functions are the same as those in modern Chinese, which are used to replace the names of people or things.
Classification:
There are the first person, the second person and the third person, as well as the person, the side address and the honorific address.
First person, also known as self-assertion. Commonly used words such as "I", "I" and "Yu", and words such as "I", "I" and "I". It can usually be translated into "I", "mine", "ours" and "ours".
The second person is called symmetry. Commonly used are "Er", "Ru", "Female", "Ruo" and "Nai". Usually translated as "you", "yours", "yours" and "yours".
The third person, also called his name. Commonly used words are "bi", "qi" and "ambition". They can be used to refer to people as well as to replace people. Their usage is flexible and they are usually translated into "he", "she", "his", "them" and "theirs".
There are other names, others. The word "person" is often used and can be translated into "others" and "others".
Baidu encyclopedia-accusative