Perfecting your ability in English generally requires at least two things: conscious and self-monitored conversation practice with one or more people who have better English than you do and plenty of reading. The conversation practice helps to improve your usage, grammar, and other aspects that might be an issue (such as pronunciation in some cases), but conversational vocabulary tends to be quite limited. That is why lots of reading is very helpful. Reading also helps to improve usage, etc., but it is mainly useful for expanding your vocabulary. It could also be useful to either write essays, etc., to be checked by someone or have someone check things that you write on a regular basis to help you in your writing ability. Obviously, non-native speakers of English require additional assistance and lots of extra work.
There isn't really a way to speak perfect english. But you can reduce using slang. You can always read books, they are most helpful. Write a diary to keep everyday is useful too. Try and hit the books more often. If possible, speak English most of the time so you can get used to it.
Practice
The mistake in the sentence "One speaks English here" is the use of "One" as the subject. It would be more appropriate to use "someone" or "people" instead of "One" to make the sentence more natural.
well when people are born they pick up on whatever their parents speak so if English is their first language that's what they ll speak. so yeah no can mistakes
Mind your language
Based on the mistakes in your question, I assume you are just learning English; but I think I understood what you were asking. Because you are new at English, you will make mistakes in grammar and you will make mistakes in pronunciation ("speak any words"= pronounce). But gradually, you will learn English grammar, spelling, and pronunciation. The best way to learn to pronounce English is to listen to people who know how to speak it. It is also good to practice in school or online. The Voice of America website has free English lessons with native speakers, which may help you. And even when you become good at English, the fact that you have an accent should not be a big problem. As you study and practice, you will learn how to say the words correctly, and people will be able to understand what you are trying to say. I wish you good luck!
Can you learn to speak proper english?
commands are mistakes commands are mistakes
"He does not", or, "he doesn't speak English" would be correct. It would never be 'he do not speak English,' as that is incorrect grammar.
Yes, colloquialisms should generally be avoided in formal written English because they are informal and can detract from the professionalism and clarity of the writing. Using more formal language helps to convey a sense of respect and professionalism to the reader.
To be able to speak English properly without any distinct accent, sometimes known as Queens English is standard.
If you can write, read, and speak a language without any mistakes, you are fluent in that language! Fluent is able to write or speak easily, smoothly, and expressively. That includes the idioms and colloquial expressions of that language.
Outsiders may or may not speak English. It depends on the individual's background, education, and exposure to the language.
Yes, I can help with that. Please provide the content that you would like me to check for mistakes.