come to the conclusion: 得出结论
I've known Steve for a year now but I have reluctantly come to the conclusion that he's a fool.
现在我已认识史蒂夫一年了，可是我却不情愿地得出他是一个傻瓜的结论。
Sir Arthur had come to the conclusion that the suspect was left-handed and had nails in his shoes.
亚瑟爵士己经得出结论：嫌疑犯是个左撇子，鞋上有钉子。

in return: 作为报答
I bought him a drink in return for his help.
我请他喝酒以酬谢他的帮助。
I'll let you borrow it on one condition: (that) you lend me your bicycle in return.
我借给你也行，但有个条件，你得把你的自行车借给我。

turn in:【美国英语】(向警察局)告发，出卖
She threatened to turn him in.
她威胁说要向警方告发他。

cheat on: 外遇
Bill take stock of the situation after Christine cheat on him.
在克丽丝汀欺骗了他後，比尔评估一下现状。