1. We don't want some chocolates.

2. We don't want some wine.
3. There aren't some strawberries.
4. There isn't some water.
[Can we use 'some' in a negative sentences like this?]

5. Some books are not useful.
6. Some boys are not good.
7. Some apples are not bad.
8. Some students are not good at baseball.
[Are the four sentences above correct?]

For 1-4, any would be better than some.

5-8 are fine.

It would be better to state the positive in 5-8. Most boys are good.

1. No, we generally do not use the word "some" in negative sentences like this. Instead, we use words like "any" or "not any" to express the absence of something. So, the correct way to say it would be "We don't want any chocolates."

2. Similarly, the correct sentence would be "We don't want any wine."

3. When talking about the absence of something, we use the word "no" instead of "not any" in English. Therefore, the correct sentence would be "There are no strawberries."

4. Likewise, the correct sentence would be "There is no water."

Now, moving on to the next set of sentences:

5. Yes, the sentence "Some books are not useful" is correct. It implies that there are books that are not useful among a larger group of books.

6. Similarly, the sentence "Some boys are not good" is also correct. It suggests that there are boys who are not good among a larger group of boys.

7. The sentence "Some apples are not bad" is grammatically correct. It means that even though most apples are good, there are a few that are not bad.

8. Finally, the sentence "Some students are not good at baseball" is correct. It indicates that among a group of students, there are some who are not skilled or proficient in baseball.