1. They had a telling-a-lie contest in the palace. Many people gathered in the palace.One man stepped up to the king and said,....

[Can we use the expression in the first sentence? do you have some other suitable expressions?]

2. Who was the biggest liar among them?
2-2. Who was the biggest liar of them?
[Can we use both?]

3. It was the old man who beat the king with his lie. He got a golden apple from the king.

4. The old man was the biggest liar, so the king had to give a golden apple to the old man.

5. He was the old man. With his lie, he made the king puzzled, and was able to obtain a golden apple.
[What about the answers? No problem? Thank you.]

1. I'd use one of these phrases instead of "telling-a-lie" --

the Liar's Contest
the Biggest Lie Contest
the Best Liar's Contest

2. OK
2-2. Who was the biggest liar of them all?
3. OK
4. OK
5. Awkward. Better might be this:
With his lie, the old man puzzled the king and was able to win the golden apple.

1. Yes, you can use the expression "telling-a-lie contest" in the first sentence. It effectively conveys the idea that people gathered in the palace to participate in a competition where they would tell lies.

2. Both "Who was the biggest liar among them?" and "Who was the biggest liar of them?" are grammatically correct and convey the same meaning. You can use either of them interchangeably.

3. The sentence "It was the old man who beat the king with his lie. He got a golden apple from the king" is clear and accurate. It explains that the old man was successful in deceiving the king with his lie, and as a result, he received a golden apple as a reward.

4. The sentence "The old man was the biggest liar, so the king had to give a golden apple to the old man" is correct. It states that because the old man proved to be the most skilled liar, the king had no choice but to give him a golden apple.

5. The sentence "He was the old man. With his lie, he made the king puzzled, and was able to obtain a golden apple" is also accurate and well-structured. It describes how the old man used his lie to confuse the king, ultimately leading to his acquisition of a golden apple.

All of the provided answers effectively explain the events in the story and are grammatically correct.