对话
Fred and Betty: Is this the End?
Episode 1: Betty's Angry

Betty: Fred, I found out about you and that other girl. How could you do this to me?!
贝蒂: 弗瑞德,我已经知道你背着我和另一个女生交往了！你怎么可以这样子对我？！

FIND OUT ABOUT
Meaning: if you find out about something, you discover a fact or information that you did not know before, often because someone was keeping it secret. 查明，弄清情况

Grammar: This phrasal verb needs an object. You can not separate the verb from its particles.
提示:在用这个片语的时候，后面要加宾语。

He found out about the theft - RIGHT
He found out about it - RIGHT

He found the theft out about - WRONG
He found it out about - WRONG
He found out the theft about - WRONG
He found out it about - WRONG
同义词扩展
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Synonyms: discover, catch on to, detect, unearth
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Discover
1. 发现
She discovered that the man was a quack.
她发现那人是个庸医。
Who first discovered America?
谁最早发现美洲大陆?
2. 发觉;找到
The lost bike was discovered at the bus stop.
丢了的自行车在公共汽车站那儿找到了。

Catch on to: 理解
I don't quite catch on to what she is saying.
我不太明白她在说些什么。

detect:发现,察觉;查出,看穿
I detected anger in her voice.
我察觉出她说话声里含着愤怒。
He soon detected the faulty valve.
他很快查到了出毛病的阀门。

Unearth: 发现;揭露
unearth a secret
发现一个秘密