"I knew it"'中文怎么说？
例子：
1. (After a fraud) I knew it! The deal was too good to be true!
2. (After finding out that his wife conducted an affair) I knew it! The love just wasn't there in our marriage.
3. (After winning a lottery) I knew it! I knew I was going to be lucky this time!

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Answer

“ I knew it !"— 我早就知道 ！
e.g-
I knew I was going to be lucky this time 
我早就知道这一次我会很幸运的！
^_^

Answer

我早就知道了。（don't miss 了）

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我早就知道， 我过去就知道，我之前就知道

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*I knew it! 
 wô zâo jiù zhī dào 我早就知道！
to express you have estimated the result beforehand.

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你的例子里面，可以简单讲：我就知道！
- 我就知道！交易（条件）太好了，不可能是真的。

可以表达事情发生之前，就应该知道事情的结果。这里有预感会发生这件事，但不愿意相信事情会发生，可以表达发现时遗憾的心情。