have第三人称单数。

"have"的第三人称单数形式是"has"。

In English grammar, verb conjugation is closely tied to the person and number of the subject. For the verb "have," its third person singular form is "has." This means that when the subject is a third person singular (such as he, she, it, John, Mary), "have" must be changed to "has."

General Rules for Verb Third Person Singular Forms

Typically, the third person singular form of a verb is formed by adding the letter "-s" to the base form of the verb. For example:

• play → plays
• come → comes
• work → works

Formation of "has"

"Have" is one of the few irregular verbs whose third person singular form is not formed by adding "-s" to the base form but by changing it directly to "has."

Example Sentences

• He has a new car. (He has a new car.)
• She has two children. (She has two children.)
• The cat has caught a mouse. (The cat has caught a mouse.)

Usage of "has" in Third Person Singular

The form "has" is commonly used in the following contexts:

• To express possession or ownership: He has a beautiful house. (He has a beautiful house.)
• To indicate a state or condition: She has a headache. (She has a headache.)
• To describe a habit or action: The dog has a habit of barking. (The dog has a habit of barking.)
• To denote necessity or obligation: You have to do your homework. (You have to do your homework.)

Negative and Interrogative Sentences

In negative and interrogative sentences, the auxiliary verbs do or does are used with "has" to form "do/does not have." For example:

• He does not have a car. (He does not have a car.)
• Does she have any children? (Does she have any children?)

Conclusion

The third person singular form of "have" is "has," used with third person singular subjects. Remembering the special form of "have" is crucial for correct verb usage.