1。否定时are改成are not提问：are Ben and his cousin in the park ？--no,they are not。或yes，they are。 疑问句；where are Ben and his cousin ？——they are in the park2。sees改为does not see提问：does he see some public signs in the park? -yes,he does或-no，he does not疑问句；what does he see in the park？3.is改为is not提问：is he asking Ben some que...
