oh

1. CONVENTION You use oh to introduce a response or a comment on something that has just been said. (引出答话、评语) 哦[口语]

"Had you seen the car before?"—"Oh yes, it was always in the driveway."

“你以前见过这辆车吗？” — “哦，见过。它总在车道上。”

2. INTERJ You use oh to express a feeling such as surprise, pain, annoyance, or happiness. (表达情绪) 哎呀[口语]

"Oh!" Kenny blinked. "Has everyone gone?"

“哎呀！”肯尼眨了眨眼，“大家都走了吗？”

3. CONVENTION You use oh when you are hesitating while speaking, for example, because you are trying to estimate something, or because you are searching for the right word. (表示犹豫) 呃[口语]

I've been here, oh, since the end of June. 我是，呃，从6月底到这儿来的。