know sb. to do sth./do sth.

这两个句子都是正确的。在know之后使用不带to的动词不定式，仅仅限于英国英语。并且动词know常常采取完成体的形式have known：

1. I've never known anyone have such shining eyes as you. 我从未看到过有谁有你这样明亮的眼睛。

2. Have you ever known her lose her temper? 你看到过她发脾气吗？

3. I have known John give better speeches than that. 我知道约翰发表过比这更好的演说。

4. I've never known her to be late before. (LEG) 我以前从不知道她迟到过。

5. I have never known a man (to) die of love, but I have known a disappointed lover (to) lose weight. (AED) 我从未听说过一个人由于恋爱而死，但我却听说过失恋的人会消瘦。

6. I have never known him make a mistake. (AEG) 我从未看到过他犯错误。

但是在被动语态中, know 必须跟带 to 的动词不定式:

1. He's known to be a coward. (CGEL) 人人都知道他是个懦夫。

2. He was known to be a spy. 人人都知道他是个间谍。

3. She is known to lie. (Evans) 人人都知道她爱说谎。

4. He was known to have/to have had a quick temper as a boy. (LEG) 人们都知道他在孩提时代脾气暴躁。

5. She is known to have the best collection of stamps in the world. (LEG) 她以藏有世界上最好的邮票而闻名。

as we know/as we know it 见 as $^{15}$

not that I know of 见 that(conj.) $^{12}$