如果我知道你没有钥匙，我就不会锁门的。

If I had known you didn't have a key, I wouldn't have loked the door.

youdao

“我没有要求做这份工作，你知道的。”他在情绪低落的时候告诉朋友们。

"I didn't ask for this job, you know," he tells friends when he is low.

《柯林斯英汉双解大词典》

你要知道，我连汽车都没有。

For your information, I don't even have a car.

《牛津词典》

You know about this but maybe you haven't thought about it at this level of detail, but you know that when you - after you eat, you eat lunch for example.

你们学过胰岛素了,但可能没有在我讲的层面上想过这个问题,但你知道的,吃饭以后,比如说你们吃午饭

耶鲁公开课 - 生物医学工程探索课程节选

So they've got these superhighways which is, I don't know if you've seen them, they are marked on in blue.

所以，他们修了这些高速路，我不知道你见过没有，他们被标成蓝色了。

伦敦的蓝色自行车 - SpeakingMax英语口语达人

I don't know if you've been to Bath. But it's very nice, but a bit boring and small.

我不知道你去过巴斯没有。那里非常漂亮，只是有一点无聊，而且那里很小。

刚来伦敦的时候 - SpeakingMax英语口语达人