1. I learned about some Chinese expressions and Chinese cultures.

2. I learned about the length of the Great Wall of China.

3. I leaned Chinese songs.

4. I learned that China has a long history. (Do we have to use 'had'?)

5. I learned that Chinese people are industrious.

6. I learned that China exports a lot of products to many countries.

7. I learned to swim from a Chinese swimming instructor.

(Are the expressions all grammatical?)

8. I learned Chinese old games.
8-1. I learned about Chinese old games.
(What is the difference between the two? Are both the same?)

1. Chinese culture (usually singular because it is one culture.

2. and 3 = good.
4. No, HAS is fine because it still has that history. "Had" would imply there is a new history now or that they no longer existed.
5. Also, the word "the" with Chinese people just makes it more specific.
6. and 7 = perfect.

8. I larned old Chinese games. = this flows much better.
Actually, I'm not fond of either 8 or 8-1! I learned old Chinese games and I learned about old Chinese games are essentially the same. I learned the games implies that I can play them now. I learned "about" the games does NOT mean that I learned the games and can play them.

Sra

1. The sentence "I learned about some Chinese expressions and Chinese cultures" is grammatically correct. However, it may sound more natural to say "I learned about Chinese expressions and Chinese culture" without using the plural form of culture.

2. The sentence "I learned about the length of the Great Wall of China" is grammatically correct.

3. The sentence "I leaned Chinese songs" seems to have a typographical error. It should be "I learned Chinese songs."

4. The sentence "I learned that China has a long history" is grammatically correct. However, if you are referring to China's ancient history, you could use "had" to indicate that it pertains to a past time period. For example, "I learned that China had a long history."

5. The sentence "I learned that Chinese people are industrious" is grammatically correct.

6. The sentence "I learned that China exports a lot of products to many countries" is grammatically correct.

7. The sentence "I learned to swim from a Chinese swimming instructor" is grammatically correct.

8. The sentence "I learned Chinese old games" is grammatically incorrect. It should be "I learned about Chinese old games." By adding the word "about," you make it clear that you gained knowledge about the games rather than learning to play them or mastering them.

8-1. The sentence "I learned about Chinese old games" is grammatically correct. Both sentences have similar meanings, but the inclusion of "about" in the second sentence clarifies that you gained knowledge or information about the Chinese old games rather than learning how to play them.