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Our Writing Centre does not have specialists who can teach English as an Additional Language (EAL). However, graduate student tutors will do their best to help you. The U of S offers EAL support via the Language Centre.
Important note: tutors cannot edit or proofread (i.e., correct the grammar and punctuation) in your paper. They can teach you about writing, though, using your work as an example of writing issues you may need to work on.
The Online Writing Lab (OWL) at Purdue University has a good section of its site devoted to ESL, including information about writing in a North American academic context.