nod过去式

过去式是nodded，意思是点头，例如：

1.I asked him if he would help me and he nodded.我问他能不能帮我一下，他点了点头。

2.She nodded as a sign for us to sit down.她点头示意我们坐下。

3.She nodded in agreement, and he saw he had carried his point.她同意地点点头，他明白他的话已收到效果。