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A good method for helping them retain vocab in general is the 'word wall' and variations on the theme. This basically involves placing new words and phrases where the students can clearly see them throughout the course, or just throughout the day.

For kids, get them to draw a picture to match the word and post the pictures up around the classroom. Otherwise, another method is to have a dedicated whiteboard or section of a whiteboard for new words. The key is not to erase the new words until the space fills up, and then give an impromptu review/test of the words.