sprains

grammar · medium

易错句子I got sprain in my ankle during the match.

正确表达I got a sprain in my ankle during the match.

sprain 作名词表示“扭伤”时是可数名词，单数形式不能裸用；汉语名词没有冠词，所以中国学习者容易漏掉冠词，这里需要用不定冠词 a 表示“一次扭伤”。

grammar · medium

易错句子He has had three sprain this year, so the doctor told him to rest.

正确表达He has had three sprains this year, so the doctor told him to rest.

sprain 是可数名词，前面有具体数字 three 修饰时，必须用复数形式 sprains（known_forms 中的复数），不能保留单数；汉语名词不随数量变化，因此容易漏加 -s。