1. The wind is stronger than the sun.
2. A mouse is smaller than a rabbit.
3. Наверное у клоунов есть имена. Если да, то лучше вставить имена вместо определений )))
The clown in red shirt is taller than a clown in yellow.
4. A rabbit is cleaner than a bear.
5. A pencil is shorter than a pen.
6. A snowman is colder than ice-cream.