Couldest
v. can的过去式\\nv. aux. can的过去式[在现在时或将来时的动词短语中作助动词, 表示有点怀疑或较小的可能性]能, 可能：
🗣️ 情景例句
And so is Max.
也是Max的幸运。
When the phone rang, I was painting upstairs.
当电话铃响的时候，我在楼上画画。
Suddenly, she saw a man near a bus stop.'I can ask him the way'.she said to herself.
突然，她在公共汽车站附近看到一个男人。“我可以向他问路，”她想。