列句：He bought a house last year.Did he buy a house last year?He didn't buy a house last year.列句：He bought a house last year.Did he buy a house last year?He didn't buy a house last year.下个句子来写：He lost his umbrella yesterday

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• 列句：He bought a house last year.Did he buy a house last year?He didn't buy a house last year.下
• 列句：He bought a house last year.Did he buy a house last year?He didn't buy a house last year.
• 列句：He bought a house last year.Did he buy a house last year?He didn't buy a house last year.下
• he bought a house last year.did he buy a house last year?he did not buy a house last year1：he bought a house last year.2：did he buy a house last year?3：he did not buy a house last year.为什么第一句用bought,而第二第三句用了buy.第一句用过去式倒还好理解,我就是不能理解第二句第三句为什么用buy与did,因为did是过去式,而buy却没有用过去式,我就是这里搞不明白.
• 列句：He bought a house last year.Did he buy a house last year?He didn't buy a house last year.列句：He bought a house last year.Did he buy a house last year?He didn't buy a house last year.下个句子来写：He lost his umbrella yesterday
• he bought a house last year.did he buy a house last year?he did not buy a house last year
• he bought a house last year.did he buy a house last year?he did not buy a house last year1：he bought a house last year.2：did he buy a house last year?3：he did not buy a house last year.为什么第一句用bought,而第二第三句用了buy.第一句用过去式倒还好理解,我就是不能理解第二句第三句为什么用buy与did,因为did是过去式,而buy却没有用过去式,我就是这里搞不明白.
• they,a,that,siad,built,year,hospital,before,they,the,last 连词组句