The best way to check if your grammar is correct is to use a grammar checking software. There are many programs available, such as Grammarly, Microsoft Word and ProWritingAid, that can help you identify any errors and make sure your writing is accurate and polished.
Another great option is to have someone else review and proofread your writing. Having another person review your work can help identify any mistakes that you may have missed, helping to make your grammar more precise.
If you don't have anyone to help you with proofreading and checking your grammar, there are a few online tools and resources you can use. Grammarly's online grammar-checker, Hemingway Editor and Language Tool are all great options to help you give your work a professional edge.
You can also try using websites such as Grammarly Answers, English Language & Usage Stack Exchange and even Reddit's /r/grammar subreddit to ask for help on any grammar-related questions that you may have.
Overall, there are plenty of options available to help you check your grammar. Whether you use a grammar checking software, an online grammar-checker, have someone else review your work or ask for help from forums, properly checking your grammar will help ensure your written work is accurate and polished.
