1. He was very fat last year .Was he very fat last year ?
2. Her purse was lost yesterday .Was her purse lost yesterday ?
3. There was a thief just now .Was there a thief just now ?
4. John lost himself in surfing the Internet three years ago .
Did Joho lose himself in surfing the Internet three years ago ?
这四个句子本来就是过去时,所以直接翻译就可以了.希望能帮到你.记得采纳哦!