How can I learn to write grammatically correct English?

Improving your English grammar in 4 easy steps! 1. READ.  If you read a lot, you will be exposed to a lot of correct grammar, internalize it, and become better because of it. 2. Get someone to proofread everything you write.  Learn what mistakes you make often, and keep that in mind as you write. 3. Just memorize some rules.  Avoid ending a sentence with a preposition, understand the difference between "Their", "There", and "They're", "it's" and "its" and other such common mistakes.  4. Reread everything you write. After you finish a paragraph or whatever, read it back to yourself as if you were talking, perhaps even read it out loud.  If it doesn't sound right, it's probably not right.

If we're talking about writing and not speaking, as the question states, then I have only two suggestions, one of which has already been stated. 1) Read. Read a lot. The more you are exposed to the rules, the more you will internalize them whether you realize it or not. 2) Learn the parts of speech. Also learn how they work together. Learn the differences between an adjective and an adverb. You don't write English correct, because correct is an adjective. You write English correctly. Correctly, an adverb, describes the way you write. Correct, an adjective, describes what you're writing (a noun, in this case English). You can write correct English, or you can write English correctly. Learn to look at your sentences as groups of nouns (and pronouns), verbs, adjectives, adverbs, conjunctions, prepositions and articles. Learn the difference between a Subject, a Verb and an Object (direct or indirect), and start analyzing your sentences as groups of these. Write a hundred grammatically correct sentences with nonsense words as practice, so you can condition yourself to stop thinking of the words in terms of their meanings. For example: My [possessive adjective] seventeen [ordinal adjective] ducks [noun, the subject] kicked [verb] a [article] ball [noun, direct object] rapidly [adverb]. The words don't matter. What is important is that you learn how the parts of speech combine to make grammatically correct sentences. Once you master this process, building sentences just becomes a matter of swapping words that make sense into a form with which you're already familiar.

Actually, it might be good if you shared with the rest what your native language is. In your mind, I assume you 'think' with your native language and then translate it into English? And subsequently, you read something in english, and then translate it back into your native language in your mind? That might be your problem there, and millions of other people around the world, literally brain-translation error. I might be able to help if you're Chinese since I've seen plenty of examples where it's a clear "translation in your head" error. Else sorry and yea, read more english. PROPER english, preferably news sites instead of forums or blogs.

English is like Math: the more you practice, the better your grammar is. So, take a lesson or investigate English grammar, and start writing ;)

A fun way to learn is reading. Pick up a book; it doesn't have to be academic literature, a story book works just as well (if not better, in my opinion) for when you read a good book, you are transported into another world, your mind is stretched by ideas it has never experienced before. The best part is, while this magic is happening, you are retaining the way the book has been written. Your brain registers how words are strung together and subtle rules, which are harder to learn when you read them as bullets, sift smoothly into your subconscious mind.  When you sit down to write after reading a few of the aforementioned magical portals, you will find it a lot easier to pen down your thoughts. Writing will be easier and faster. You might find it a little difficult to begin, but once you get started, after maybe the first few lines, you will be able to carry on writing with much better grammar with ease. Another good but a little more tedious method is to converse in English with friends and family. Find someone who has good command over the language and also is willing to correct you forthwith. My roommate had a similar problem. We tried a similar solution. I remember spending hours and after-hours talking to him and correcting him. He has improved a great deal and has even bagged a bunch of scholarships despite this major third language barrier. Hope this helps.

Frankly, the best place to see grammar in action is in reading. The more exposure you give yourself to the correct usage, the more you will see, learn, and eventually understand the correct usage. The rules don’t vary much between fiction, non-fiction, newspapers and magazines.A friendly word of advice: if your writing currently sucks, you may need to engage a competent writing coach to bring you up to speed.So in response to your question, I like to append herewith my slew of practical tips, based on my fast and versatile reading and writing experiences:1)  Read, read, and read widely, and deeply, both mainstream and the  fringe: newspapers, magazines, newsletters, journals, reports, storybooks, all types of novels, business books, informative books (like encyclopedias), literary and scholarly works, and even bill boards, bulletin boards, wall posters, merchandising displays, ad blurbs, and  mailshots in your In-Box, online as well as offline; 2) Maintain a roving eye for interesting words  or phrases or sentences, in (1) and see how they are strung masterfully  together to express ideas or messages eloquently and succinctly across  to the reader;3) While reading your daily newspaper, pay particular attention to three specific areas: a) the editorials; b) the economic analyses; c) the political commentaries; These  segments - with powerful word choices - are usually written by editors and senior journalists, with a  seemingly impeccable command of the English Language;4) While watching movies or television programs, sitcoms, talk shows,  debates on hot issues, interviews with VIPs, etc., maintain a roving eye and ear for interesting as well as intriguing dialogues or fun conversations;5) Always keep a large note book handy to capture all the stuff in (1) to (4); This initiative is called sentence mining;6)  Write, write, and write, as much as you can, and formally of course, and make sure you use the  captured stuff in (5) to enliven your own everyday language expressions,  in emails  or blogs or reports or proposals, etc.,in addition to helping you to  internalise the new vocabulary; Moreover, writing voraciously also enhances your vocabulary and grammar;[Tip: My good buddy based in Mumbai, India, Dilip Mukerjea, an accomplished author and also a strategy consultant, recommends writing every day, at least 500 to 1000 words, or more.]7) Use as much of the stuff you  have captured in (5) in your daily dynamic speaking activities, too: conversations, dialogues, discussions, meetings, sales presentations or elevator pitches, web-casting, pod-casting, public speaking gigs, etc.; 8) When you think about grammar, and hear it in speech, read it and use it when writing, notice the aspects of English grammar that are the same as, or very similar to those in other languages. This is particularly helpful if you are trying to improve on your English grammar where English is not your first language. Notice also the way that English expresses an idea differently to how it is done in your language.  If you notice grammar similarities and differences, you will probably learn the rules more quickly.9) Just a slew of additional tips to power up your writing: Tip: Quora is a pretty good platform for you to write. Start with simple topics. Just give your two cents, but in an entertaining and yet  formal manner; Tip: Post your commentaries - make them formal -  regularly on other people's blogs or articles, or Forum Pages of your local daily; Tip: Write formally and regularly to your friends or pen-pals, just to exchange ideas; Tip: Reflect and write in your daily journal, preferably with formal expressions; Tip: Every time after you have read a newspaper piece or listened to news broadcast, or even watched a movie, write a short commentary about your impressions or feelings, say in a notebook. Tip: Post your movie review, if any, at http://www.imdb.com/; You may even want to start your own personal weblog, just for the fun of it [I actually started 5 in 2007 and the ensuing years, even though I have stopped in recent years due to shifting interests.]; You may want to read this: 22 lessons from Stephen King on how to be a great writer - http://www.businessinsider.com/stephen-king-on-how-to-write-2014-8; I also append herewith: Henry Miller’s 11 Commandments of Writing and Daily Creative Routine - https://www.brainpickings.org/index.php/2012/02/22/henry-miller-on-writing/; Meanwhile, here's the Purdue Online Writing Lab, a wonderful resource for writers! - https://owl.english.purdue.edu/owl/section/1/; You may want toe explore: https://prowritingaid.com/art/111/10-websites-to-help-improve-your-grammar.aspx; To   sum up my proposition,  the fire test of your writing prowess comes from  the  massive utility and consistent practice in your everyday life and/or workflow activities, involving real-world   communication with real people,  as much as possible.[20160415_Grammar and Writing]

Here is probably the most unusual answer that you may ever receive on this issue:Learn from Elementary English WorkbooksNow before you make a funny face, consider the fact that these are what every English-speaking American used to learn, speak, read, and write the language from Kindergarten to the 6th grade. Those seven years are critical for forming the basis of a sound English education, with higher grades reserved for perfecting the art of writing via experimental approaches and other genre-based requirements. You don't need all of that right now, and any other type of instruction might overwhelm you with concepts that are too advanced or even irrelevant. So that's why I recommend learning English from books for children.They're extremely easy to understand (for obvious reasons) and they can even be a bit entertaining. The key benefit, of course, is that they teach grammar at the beginner level, which is what you need.

The original question is: How can I learn to write grammatically correct English? Answer:There is no substitute: you must read grammatically correct English. Start with a novel from the list at: http://www.modernlibrary.com/top-100/100-best-novels/ or http://www.telegraph.co.uk/books/what-to-read/100-novels-everyone-should-read/.

I would also recommend reading, taking note of grammatical forms and word order and  copying them when you write. When you come to complex sentences with subordinate clauses try to work out what is going on and why. Keep your writing simple at first. As your knowledge of grammar increases your writing can develop too Get hold of an introductory grammar text book (Teach Yourself English Grammar is a useful introduction to grammar). Work through the chapters. Do the exercises. Repeat them till you are word perfect. Now you are ready to move up to am advancef instructional reference book like Advanced Grammar in Use (Hewings),  both for learning and reference purposes.