As a copy editor with experience in SEO, I understand the importance of using proper grammar and syntax to enhance search engine optimization. One area of concern that often arises is the use of the contracted negative form "shall not."

The contracted negative form of "shall not" is "shan`t," which is commonly used in informal speech. However, when it comes to writing in a professional context, it is advisable to avoid using it. The reason is that "shan`t" is considered a colloquialism, and using colloquialisms in professional writing can negatively impact the credibility of the content.

On the other hand, using "shall not" in its uncontracted form is grammatically correct and helps to maintain the formal tone of the writing. For example, instead of saying "I shan`t be able to attend the meeting," use "I shall not be able to attend the meeting."

Furthermore, using the uncontracted form of "shall not" can have a positive impact on SEO, as search engines tend to favor well-written, grammatically correct content. Additionally, using proper syntax helps to ensure that the meaning of the content is clear, which can help to reduce bounce rates and increase engagement.

In conclusion, as a professional, I strongly recommend avoiding the use of the contracted negative form "shan`t" and instead using the uncontracted form "shall not" in professional writing. Not only does this help maintain the formal tone of the content, but it also has a positive impact on search engine optimization.