Final answer:
Kenny would benefit from further instruction in the use of relative pronouns and subject-pronoun agreement. He incorrectly used 'which' instead of 'whom' for a person and 'who' instead of 'which' for a place. Practicing and learning in context, and peer editing sessions can help improve his understanding.
Step-by-step explanation:
The statement written by Kenny, an ELL (English Language Learner), indicates that he would most benefit from further instruction in the proper use of relative pronouns and the agreement between subjects and their pronouns. In his sentence, 'My friend, which I met at college, comes from San Marcos, who is located near San Antonio, Texas,' Kenny improperly uses 'which' to refer to a person, when 'whom' would be the correct relative pronoun. Furthermore, he incorrectly uses 'who' to refer to the city of San Marcos, for which 'which' is the proper relative pronoun as it refers to a place, not a person.
Instruction could involve practicing the use of relative pronouns through various activities such as filling in the blanks, rewriting sentences correctly, and understanding the context of pronoun use. Additionally, Kenny could benefit from contextualized examples that highlight the differences in usage. An emphasis on peer review and editing sessions may also help Kenny identify and correct these types of errors in his writing.