Have is used with the pronouns I, you, we, and they. Has is used with he, she, and it. Have and has can indicate possession.

Can we use has for he?

Has is used alongside the PRONOUNS He / She / It and Who and SINGULAR NOUNS. However, there are some exceptions which will be explained later on in the lesson. In general, has is a PRESENT TENSE word.

Should he has or should he have?

The phrase should have indicates a missed obligation or opportunity in the ... Tom and Pauline are so selfish, they should have (should've) been there for you. The modal auxiliary should has a past form, should have, which is used before the past participle of a verb.