In order to ensure that he can attend the meeting,I called him up in advance.to在这里不是介词吗?

分类: 作业答案 • 2022-01-13 08:28:32

问题描述：

In order to ensure that he can attend the meeting,I called him up in advance.to在这里不是介词吗?
为什么ensure后面不加ing?

答

因为in order to 后要接动词原形,即 to + 动原构成不定式.