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It looks like you've stumbled upon the page of learning. Here, you can refresh your memory in areas that are considered to be pretty difficult for many individuals. The tones can get pretty hard to remember and when it comes to reading Hmong, it can get confusing if you're unsure which letter indicates which tone. You can get a quick refresher here for the tones.
Another difficult thing to remember are the members in your family. Your brother or sister, in English, is simply your brother or sister, but in the Hmong language can be something completely different depending on whether you are a boy or a girl and whether they're younger or older than you. Here, You can get a quick refresher for your family tree.