Mejor Respuesta - Seleccionada por quien preguntó.Hello Jean,
Your spoken English is relatively better because you most probably use simple sentences for every day small talk or daily conversations.
To write comprehensions , letters or any other form of written material you will need to increase your vocabulary remarkably as well as your mode of expressions.
You will need also to enhance your ability to write correct sentences without any grammatical errors or defect in sentence structure.
Here are some tips to improve your writing skills:
- Read at your level of comprehension simple texts or books and looking up new words .
-Make lists of words you learned and categorize them, e.g words you use at the office , words you use at school , greetings etc....
- Keep a diary in English . Try to use the new words you learned to write and compose simple sentences .The more you add up to your vocabulary, the more you can form intricate ones. Test your level!.