Review basic grammar. Many of us use incorrect grammar without ever thinking about it, and proper grammar is one of the most important elements of good elocution. Several websites, such as Englishclub.com, Ucalgary.ca and Commnet.edu, have comprehensive grammar sections that can help you review the basics with your student. Tell your student to avoid using slang or colloquial English when it is not appropriate.
Practice pronunciation. People often mispronounce words, which results in poor elocution. Review the basic English sounds, and look up difficult words in a free online dictionaries. You may also find it useful to record your student reading a passage and then play it back so she can hear common mistakes she is making. Compare the recording with one of your own or with someone who has excellent pronunciation skills.
Try tongue twisters to improve diction. Many people are sloppy speakers, but good elocution demands that speakers pronounce words clearly and distinctly. Tongue twisters are a great way to test and improve diction. Start off slowly, and gradually have your student increase his speed. Websites such as Uebersetzung.com have a number of tongue twisters available for free.
Monitor your student's body language. Good elocution is about effective public speaking. Many people pay too much attention to the speaking component and not enough attention to their actions. Effective gestures and confident body language all contribute to elocution. Use a camcorder to record your student's movement, and play it back for her to watch.
Enroll your student in a debate or elocution club. These clubs hold meetings where members argue about an important issue or simply speak on a subject of their choosing. Once your student is confident in his abilities, he needs to practice them. These clubs are good, low-pressure forums where people can work on their elocution.