A sentence or series of words that is hard to say correctly is called a tongue twister in English. Children love tongue twisters and challenge their friends to try to say them fast several times in row. For English learners, tongue twisters are a fun way to work on one or two sounds at a time to get the pronunciation just right. You should start by saying the tongue twister slowly, repeating it and then building up speed. Try to say the tongue twister a few times in a row, as fast as you can, for a bigger challenge. Practice the following tongue twisters several times a day and see if you notice any improvement in your pronunciation.