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一句英语句子的问题The gaoler decided to play a joke on his colleague

来源:学生作业帮 编辑:百度作业网作业帮 分类:英语作业 时间:2024/06/23 23:02:54
一句英语句子的问题
The gaoler decided to play a joke on his colleague to find out if,after so many performances,he had managed to learn the contents of the letter by heart.
为什么要再if的后面加逗号,语法不是很懂.
一句英语句子的问题The gaoler decided to play a joke on his colleague
after so many performances 是插入语,为了方便理解,插入语可以先提出来,原句变为The gaoler decided to play a joke on his colleague to find out if he had managed to learn the contents of the letter by heart.
插入语不占句子成分,前后都加逗号,更方便观察出某部分是插入语.