Jawaban:

1. My grandfather passed away. At that time I was only six.

The man, who passed away when I was only six, was my grandfather.

2. You refused to come. can you tell me the reason?

Can you, who refused to come, tell me the reason?

3. We sent a package to our relatives. They live in Bandung.

We sent a package to our relatives who live in Bandung.

4. The woman works as an anchor. She sits next to me in class

The woman, who sits next to me in class, works as an anchor.

5. We bought some trees. Our neighbour told us they were on sale

We bought some trees which were on sale.

6. The car has a bad engine, I bought it last month

The car, which I bought last month, has a bad engine.

7. I live on central avenue. It has a very wide street.

I live on Central avenue which has a very wide street.

8. You should see a doctor. He can help you with your back problems

You should see a doctor who can help you with your back problems.

9. The earthquake was extremely powerful. it hit Malang.

The earthquake, which hit Malang, was extremely powerful.

10. We saw the woman at the market. She lives next doors to us

The woman, who lives next door to us, was at the market.

Penjelasan:

Adjective Clause bisa disebut juga sebagai relative clause yang masuk dalam dependent clause. Adjective atau relative clause berfungsi untuk menerangkan noun (kata benda) dan juga pronoun (kata pengganti) pada sebuah kalimat.

1) WHO

Digunakan untuk menjabarkan orang (people) dan berfungsi sebagai pengganti posisi subyek.  

Contoh:

The girl who spoke about the boy is standing over there.

The boy, who was angry at his friend, bit his hand.

A 70-year-old man, whose house was recently struck by lightning, said he lost everything.

2) WHICH

Digunakan untuk menjabarkan kata benda dan hewan. Berfungsi pengganti posisi subyek, obyek.

Contoh:

Give me some food which  I may eat.

Semoga membantu ya.