They went far into the forest,his brother ____(act) as a gui

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/21 09:00:42

They went far into the forest,his brother ____(act) as a guide
为何填ing

现在分词acting
因为,这个句子,没有连词,只是逗号相连,因此,这不是复合句,只是简单句,只能有一个动词.
谓语动词已经是went 了,因此,第二个动词act 要转换成非谓语动词形式.
这里,act 的逻辑主语是his brother,之间是主动关系,因此用现在分词
要是是被动关系,则用过去分词,表目的或将来,则用不定式

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