What is the difference between formal and informal English?

Formal and informal English refer to different registers or styles of the language that are used in various contexts. The main differences can be summarized as follows:

1. Vocabulary: Formal English tends to use complex or technical vocabulary, whereas informal English commonly employs simpler, everyday words.

2. Sentence structure: Formal English follows the conventional rules of grammar and syntax more strictly, while informal English may use more colloquial or fragmented sentence structures.

3. Tone: Formal English generally has a serious, professional, or academic tone, while informal English is more relaxed, conversational, and may contain humor or slang.

4. Pronouns: Formal English follows the general rule of using pronouns such as "you," "we," or "they," while informal English often uses pronouns like "I," "me," or "us."

5. Verb forms: Formal English adheres strictly to verb tenses and conjugations, while informal English may be more flexible and relaxed with verb usage.

6. Contraction usage: Formal English avoids contractions (e.g., "do not" instead of "don't"), whereas informal English utilizes contractions more frequently.

7. Politeness: Formal English emphasizes politeness and uses more polite phrases, while informal English can be more direct and less formal.

8. Writing style: Formal English follows a more structured and organized writing style, often using passive voice, while informal English allows for a freer writing style with more active voice and personal opinions.

It's important to note that the appropriate use of formal or informal English depends on the specific context, audience, and purpose of communication.