问题描述：
that,this可以替代it做形式宾语或者主语吗?
例如：I found it very useful to read the guidebook.可以写成 I found this very useful to read the guidebook.或 I found that very useful to read the guidebook.
例如：I found it very useful to read the guidebook.可以写成 I found this very useful to read the guidebook.或 I found that very useful to read the guidebook.
问题解答：
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