In Taiwan, “motorpool” is commonly known as a place for the maintenance of official business and government cars. In 1 it is a place for vehicle maintenance. More than ten years ago, I came to America on business and I 2 advantage of the chance to visit my friend. My friend drove a car to 3 me at the airport, and took me to his home. 4 the airport, my friend drove his car into the innermost lane, 5 had a sign “carpool only”. I wondered what “carpool” meant. I felt 6 whether he was going to a motorpool. So I thought myself 7 in asking: “Is there anything wrong with the car?” “Nothing, 8 ?” said he. “Well then, why are you going to a carpool?” I responded. My friend couldn’t help 9 and told me that “carpool” 10 to the lane that only the cars with two or more passengers can 11 . I felt rather embarrassed 12 that. After dinner, my friend’s neighbor 13 to ask whether he could carpool the next day. “ 14 ,” my friend said, “I will accompany my friend to go shopping tomorrow.” I was puzzled again, 15 why he could not “carpool” with him since we had “carpooled” 16 . My friend explained to me again that the “ carpool” with him that 17 used meant they in turn drove the car to work so as to save 18 . The first “carpool” is a noun; 19 the second “carpool” is a verb. It is really difficult for 20 in America to understand it in a short time.