When the children are too young to walk that far,their mothers take turn driving them to school.take turn 是不是词组,后面为什么用ing形式

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When the children are too young to walk that far,their mothers take turn driving them to school.
take turn 是不是词组,后面为什么用ing形式

take turn 是词组,是轮流的意思
turn是个介词后面用到动词的时候要用ing形式的!

take turn 动+介后面动词当然使用ing了.