a couple days ago的用法和样例：
- You know, nate and I just split up for a couple days ago, and I can't.
- A couple days ago I finally got being a good startup founder down to two words: relentlessly resourceful.
- A couple days ago, Palu decided that Michele's finger is not good any more, and just didn't want his medicine no matter how we begged him.
- A couple of days ago she had a bout of gastritis.
- Didn't you drink chrysanthemum only a couple of days ago?