Penjelasan:

It is important to use proper grammar, punctuation and capitalization in English writing for several reasons:

1. Clarity: Properly written English makes it easier for others to understand and interpret what is being said. Improper grammar, punctuation, and capitalization can lead to ambiguity and confusion, making it difficult to understand the writer's message.

2. Professionalism: Proper English shows that the writer is educated and professional, which can positively impact how others perceive them. Proper grammar also demonstrates the writer's respect for the language and their audience.

3. Attention to detail: Proper writing shows that the writer is attentive to detail, which is a valuable trait for professionals in various fields, such as education, law, journalism, and public relations.

4. Improved learning: Proper English can help students and adults improve their writing and language skills, leading to better academic success and personal development.

5. Better communication: Proper English can facilitate better communication between people, which can be important for personal and professional relationships.

In summary, using proper grammar, punctuation, and capitalization in English writing is important because it facilitates clear communication, demonstrates professionalism, indicates attention to detail, and promotes personal and academic learning. Proper English can also improve interpersonal relationships and enhance a writer's credibility.