Subject clause depends on what clause it is and what role it plays;
The choice of relative pronouns who and that? Relative pronouns who and that can refer to people, sometimes with different usages. ? (1) Where is the relative pronoun who used? 1. WHO can represent people, anthropomorphic animals, people or creatures in fairy tales. For example:? 1) The barking dog is our pet? Who wants to go, please sign here. 2. In clauses, the subject tends to use who. For example:? 1) The girl who danced beautifully that day gave us a performance. ? Do you know the man who just spoke? ? 3. When those antecedents refer to pronouns, they refer to pronouns who often use them. For example:? No pains, no gains? We really need people who can work hard. 4. who is often used when there is an indefinite article before the antecedent. For example:? I have found someone who can do the job. ? 5. Yes
In sentence patterns, who is often used as subject and person, or omitted For example:? Someone outside the office wants to see you. ? 2) There is a man living in that village. ? 6. indefinite pronouns, a few, anyone, etc. Used as a antecedent, who is often used. For example:? People who work without regrets are welcome here. ? 7. Attributive clauses and antecedents are separated. Who is used when the use may cause ambiguity. For example:? I saw a man in the street. He was surrounded by many people. ? If this sentence uses that, it may be considered as an attributive clause that modifies street.