以下是一些适合三年级学生的英语绕口令：

1. She sells seashells by the seashore.(她在海边卖贝壳。

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2. How much wood would a woodchuck chuck if a woodchuck could chuck wood?(如果一只土拨鼠会扔木头，那么它能扔多少木头？)

3. I saw Susie sitting in a shoe shine shop.(我看见苏茜坐在鞋店里面。)

4. Peter Piper picked a peck of pickled peppers.(彼得·派珀摘了一小袋泡菜辣椒。)

5. Mary had a little lamb, it's fleece was white as snow.(玛丽有只小羊羔，它的毛皮雪白如羊毛。)