1. What was the old man’s lie?

2. You promised me a bag of gold.
2-2. It was that you promised me a bag of gold.
2-3. It was you promised me a bag of gold.
2-4. It was, you promised me a bag of gold.
2-5. It was, "You promised me a bag of gold."
[Which answers are suitable?]

3. Finally, what did the old man do?
3-2. Then, what did the old man do?
3-3. After the conversation, what did the old man do?
3-4. After he said that, what did the old man do?
3-5. After talking with the king, what did the old man do?

4. He walked away with a golden apple in his hand.

[Which questions do people usually use?]

2-2 is the best answer; 2-3 is OK, but a bit clunky. The others don't work.

All the questions among the 3's are OK, but I'd remove the comma after "Then" in 3-2.

1, 2, and 2-2 are suitable. 2-3, -4, and -5 are not. 3-2 is wrong (no comma after "then"), otherwise all in 3 are okay. 4 is fine.

1. To determine what the old man's lie was, we need more context or information about the situation or story you are referring to.

Regarding the suitable answers for the question "What was the old man's lie?":
- Answer 2 and 2-5 are both suitable. "You promised me a bag of gold" is a direct and concise response to the question, indicating that the old man's lie was about being promised a bag of gold.

Regarding the suitable answers for the question "Finally, what did the old man do?":
- Answer 3, 3-2, and 3-4 are all suitable options. Each of these answers accurately conveys the intended meaning of the question, asking about the old man's actions following the conversation or statement made.

As for the question "Which questions do people usually use?", it seems to be asking about common ways people might phrase a certain question. It's difficult to provide a definitive answer without a specific context, as question phrasing can vary greatly depending on the topic, situation, or individual preferences. However, all the options you have provided for question 3 seem appropriate and could be used depending on the specific circumstances.