Defining and Non-defining relative clause

Defining relative clause

100

I spoke to one of the women. She was the one wearing the red skirt.
I spoke to ............................ the red skirt. (who)

the woman who was wearing

200

We stayed in the Lodge Hotel in Vermont. It was our honeymoon.
It was the Lodge Hotel in Vermont ................... . (where)

where we spent our honeymoon

300

Give me the scissors. Give me the ones that cut well.
Give me the ................. . (which)

scissors which cut well 

400

Radio was invented in the early 20th century. Marconi was the famous inventor.
Marconi became famous in the early 20th century ...................... the radio. (when)

when he invented 

500

My wife hit that dog with the car. The dog was very old.
That's the dog .......................... the car. (whom)

whom my wife hit with 

Non-defining relative clause

100

Mario is the guy who cuts my hair every month. He's 37 today.
Mario,............... , has his birthday today (who)

who cuts my hair 

200

Carol's house is the largest in the street. She's my neighbor.
My neighbour is Carol,......................  in the street. (whose)

whose house is the largest. 

300

We'll meet at Christmas. We'll talk about it then.
We'll talk about it at ........................ be at home. (when)

Christmas, when we can be

400

A chemist's is a shop that sales medicines.
YOU

A chemist's is a shop, ........................ medicines.

WHERE YOU CAN BUY | IN WHICH YOU CAN BUY 

500

Their dog is called Ben. They've had it for ten years.
WHICH

Their dog, .........................for ten years, is called Ben.

WHICH THEY'VE HAD | WHICH THEY HAVE HAD 

Defining or Non-defining

100

Bangkok, which is the capital of Thailand, has many excellent restaurants and markets.

Non-Defining Relative Clause

200

He gave me the letter, which I read immediately.

Non-defining Relative Clause

There was only one letter.

300

He gave me the letter which was in a blue envelope.

Defining Relative Clause

There were several letters of different colors and he gave me the blue one.

400

The house whose doors are shuttered is rumoured to be haunted!

Defining Relative Clause

500

She gave me a cupcake, which was red velvet flavoured.

Non-defining relative clause

The first example gives extra information about a single cupcake.