请问这里的to难道不应该是can 或者be able to吗

如图所示这里的to难道不应该是can 或者be able to吗？I have known后面这个宾语从句里为什么没有谓语啊？

know在该句中并非后接宾语从句，而是后接复合宾语，即不定式（带to或省略to）为宾语补足语。句子谓语动词必须是完成体、牛津词典对此有解释：

[transitive]

(only used in the perfect tenses)

to have seen, heard or experienced something

know somebody/something (to) do something I’ve never known it (to) snow in July before.

曹荣禄 -

擅长：动词用法,句法问题 | 采纳率 82% | 回答于 2023-08-08 00:47

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