Why you cannnot use yes in affermative sentences but you can use not in negative sentence?

Answer 1

Yes you can use the word 'yes' in affirmative sentences. (for example)

Answer 2

In some Asian cultures, using direct affirmation like "yes" can be seen as confrontational or impolite, so people may opt for softer language such as indirect affirmation or agreement. On the other hand, using "not" in negative sentences can help soften the impact of a negative statement or express disagreement more politely.