have an affair的用法和樣例：
例句
- There's a rumour going round that Sue and David are having an affair.
有謠傳稱休和戴維關係曖昧。 - They were having an affair under my very nose, and I didn't even realize!
他們就在我眼皮底下勾搭上了，而我竟沒看出來！ - They had an affair once, but that's ancient history now.
他們曾經有過一段曖昧關係，但現在那已成為遙遠的過去了。 - Did you know he was having an affair?
你知道他有外遇了嗎？？
