1.I wanted to buy a watch for my sister.我想买个手表给我妹妹。2.Shenzhen became a big city in just 10 years.深圳仅仅在十年内就成为了一个大城市。3.Are there any books on the desk? 课桌上有一些书吗?4.The teacher visited the city five years ago .老师五年前拜访过这个城市。