You will discover some useful tips about writing sentences, paragraphs, and essays.

Here you will find lots of useful information to help with your writing in English. For example, over 130 instructional handouts are available on subjects such as punctuation, spelling, and writing research papers and citing sources. Originally designed for native speakers, this site now has a special section for ESL students which includes explanations about the use of articles and the use of prepositions in English. In addition, there is a list of resources on the Web for ESL students.

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Take a quiz on punctuation and then submit it for immediate correction. This site is part of Dave's ESL Cafe. 
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Another punctuation quiz at Dave's ESL Cafe.