Question inspired by Malcolm X who allegedly copied every single word from a dictionary by hand and greatly improved his language skills. Is there any merit in doing it, or is it just a romanticized anecdote?
closed as off topic by simchona, user2683, Matt E. Эллен♦, RegDwigнt♦ May 18 '12 at 8:38
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While it might help your handwriting skills, through so much practice, and you will undoubtedly come across many words that are new to you so you will widen your vocabulary, I can't imagine for one moment it would help your English skills.
If it did, this would be the method taught in schools.
Instead, what is taught is appreciation of literature, review of various forms of media, study of noted authors etc. which gives a view of how others have written novels, documents, articles and other forms of English language use.
I know of a person who read the whole of Webster's Third New International Dictionary (a little book of some 2800 pages) who attributed much of her fine vocabulary to having done so. I think she read it not to improve her language skills, but because her skills were so good to start. That case aside, if you begin assiduously copying out a dictionary at a young age, and keep at it until your age has doubled, meanwhile never shirking a whit in other aspects of life such as schooling, certainly your language skills will markedly improve.