改错：In the afternoon I did some baby-sittings, for it is a fun looking after children.

问题描述：

in the afternoon i did some baby-sittings,for it is a fun looking after children.这个是改错，要怎么改

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最佳答案：

In the afternoon I did some baby-sittings, for it is fun looking after children.

把 a fun 改成 fun，去掉 a，fun是不可数名词。