My grandfather, ____ is 90, still reads the newspaper every day.
- A. who(correct answer)
- B. that
- C. which
- D. whose
Why: A person, after a comma: who. Never that.
B114 questions · Intermediate · Conjunctions, Clauses and Linking
Practise extra information between commas: who, which, whose and where, never that, never leaving the relative word out, and which for a whole idea. Answers and short explanations included.

1.My grandfather, ____ is 90, still reads the newspaper every day.
Why: A person, after a comma: who. Never that.
2.Nha Trang, ____ is famous for its beaches, is busy in summer.
Why: Nha Trang is the subject of is famous: which. Where needs its own subject after it.
3.Phong didn't come to the party, ____ surprised everyone.
Why: The whole event surprised everyone. Use which.
How to add extra information with who, which, whose and where between commas, why that is never used, and how which can refer to a whole idea.