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University of Sydney (Australia)
The Write Site: Common Mistakes
This interactive exercise provides eight questions for students. Students will identify verb errors and sentence fragments.
Online Writing Lab at Purdue University
Purdue University Owl: Exercise: Commas With Nonessential Elements Exercise 2
This Purdue University OWL (Online Writing Lab) provides practice with identifying essential and nonessential phrases and clauses. Students will complete the sentences and provide commas where necessary.