Sorry that I am coming late to this thread. I "teach" French to preschool - I say "teach" only because at that age, it is more about exposure to the language that teaching lessons on vocab, grammar, etc. If you want to spend $ on a cirriculum, I would recommend La Jolie Rond - published in the UK. A little pricey but it worked well - I didn't care for the CDs much as the songs are often too fast for little ones to hear and understand.Â
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I HIGHLY recommend Simple Songs that Teach French CD (and lyrics) and the optional lesson plans that accompany it (those aren't really necessary though) - I think they are about $10 each. My preschoolers LOVE it - it gives all the basics (ABC, 1-20, days, months, colors, food, greetings, animals, etc.) - perfect speed, these are FUN songs. In working on the "simple songs" I ususally use french posters (ABC, 1-20, etc.) to help connect the visual and the auditory part of the learning. I really like learning through song at the pre-reader stage as it is FUN and it gets soaked up into their minds so quickly.