tooth在否定句中用法

原文:

Another adaptation reducing the weight of birds is the absence of some organs. Females, for instance, have only one ovary. Also, modern birds are toothless, an adaptation that trims the weight of the head.

同义替换:

Modern birds do not have teeth, an adaptation that reduces the weight of the head.

请教老师,在这里为什么用 teeth而非toothtooth不可用于否定句吗?

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最佳答案 2023-05-10 17:02

tooth 是可数名词。“没有牙齿”可以说 have no tooth , have no teeth, do not have a tooth, do have (any) teeth 等,但是不能说 do not have tooth。( be toothless 中的 toothless是形容词,意思是“没有牙齿的”)

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  • 吴祎璇 提出于 2023-04-23 20:57