There was a cat and a mouse living in a house. The cat had tried hard to catch the mouse but had never suceeded. He tried to walk quietly but unfortunately, the mouse always heard the lowest sound. One day when the mouse was resting in his place, he heard "Woof woof". "Oh a dog!" - he thought - "then the cat couldn't be around and I can get out for a piece of cheese". He got out. But right away he was caught. The cat smiled "Ha ha, now you see? It's very useful to learn another language!"