Complete defining and non-defining relative clauses with 'that', 'who' or 'which'.
Defining relative clauses:
I saw a boy who ran out of my office.
I saw a boy that ran out of my office.
Non-defining relative clauses:
My dad is 75. He still works.
My dad, who is 75, still works.
Defining and non-defining relative clauses exercises with answers and grammar rules.
For elementary - intermediate learners of English as a foreign language.