GRAMMAR: relative clauses (recap Ch 4)
The man who stole the phone was arrested.
The cat which escaped from the house was found.
This is the pen that I lost last week.
My best friend, who is 15 years old, lives close by.
Lulu, whose dress is beautiful, is at the party.
That’s the house in which we live / which we live in.
who: people/persons; which: animals, things
that: people, animals, things (more informal)