What is the difference between a positive and a negative sentence? Provide examples.

A positive sentence is a statement that expresses something as true or affirmative, while a negative sentence is a statement that expresses something as false or denies its existence. The main difference lies in the use of words or phrases that indicate positivity or negativity.

Positive Sentence Examples:
1. "She is a talented singer." - This sentence affirms that the subject (she) possesses the quality of being a talented singer.
2. "I enjoy playing the piano." - This sentence states the speaker's positive feeling towards playing the piano.

Negative Sentence Examples:
1. "He is not a good swimmer." - This sentence denies the subject's (he) ability to be a good swimmer.
2. "I don't like spicy food." - This sentence expresses the speaker's dislike or refusal towards spicy food.

In positive sentences, words like "is," "are," "am," "do," "does," "enjoy," "like," etc., are commonly used to affirm or state something as true. On the other hand, negative sentences often include words like "not," "don't," "doesn't," "can't," "won't," etc., to negate or deny something.

It is important to note that negative sentences can also be formed by using negative words such as "never," "no," "none," "nobody," "nothing," etc. For example:
1. "I have never been to Europe." - This sentence denies the speaker's experience of visiting Europe.
2. "There is no milk in the fridge." - This sentence negates the existence of milk in the fridge.

In summary, the difference between positive and negative sentences lies in the affirmation or denial of a statement. Positive sentences state something as true or affirmative, while negative sentences deny or negate the truth of a statement.