Final answer:
The subordinating conjunction in the sentence 'When I visit the library, I borrow a book.' is 'When'. It connects the subordinate clause to the main clause, indicating a time relationship.
Step-by-step explanation:
The student's sentence "When I visit the library, I borrow a book." contains the subordinating conjunction 'When'. A subordinating conjunction is a word that connects an independent clause to a subordinate clause, introducing the subordinate clause and indicating the relationship between the two clauses.
In this sentence, 'When' introduces the time-related subordinate clause 'When I visit the library,' which cannot stand alone as a sentence. This subordinate clause adds additional information to the main clause 'I borrow a book.'
The subordinate conjunction in the sentence 'When I visit the library, I borrow a book' is when. A subordinate conjunction is a word that connects a dependent clause to an independent clause.
In this case, 'when' is connecting the dependent clause 'When I visit the library' to the independent clause 'I borrow a book'