Singular Subject:
* He is used for a singular male subject.
* Example: He went to the store.
Plural Subject:
* They is used for a plural subject (two or more people or things).
* Example: They went to the store.
Non-Binary/Gender-Neutral Subject:
* They is increasingly used as a singular pronoun for someone whose gender identity is non-binary or unknown.
* Example: They said they were going to the store.
Avoiding Gendered Pronouns:
* If you don't know someone's gender or want to avoid using gendered pronouns, you can use they/them as a singular pronoun.
* Example: The person at the desk said they would help me.
Using "he" and "they" together:
* You can use he and they together in a sentence if you are referring to a group of people that includes at least one male individual.
* Example: He and they went to the store.
It's important to note: The use of "they" as a singular pronoun is becoming more accepted, but some people may still find it grammatically incorrect. If you are unsure, it's always best to ask the person you are referring to what pronouns they use.