1. Russia is the biggest country in the world.

2. Mount Everest is the highest mountain in the world.

S + be+ the  +ADJ + est: ss nhất 

3. Sydney, which is not the capital of Australia, is the largest Australian city.

N (vật) + which + V/ S+ V 

4. I don't like the man who is going out with my sister.

N (người) + who + V 

5. He asked me what I was going to do at the weekend.

S + asked + O + WH + S+ V (lùi thì)

TLG --> was/were + going to + V1 

6. He asked me where I would work after graduation.

S + asked + O + WH + S+ V (lùi thì)

will --> would 

`color{orange}{~MiaMB~}`