say的过去式英语怎么写

例句：

I fumbled for something to say.

我苯嘴拙舌找话讲。

Could you say it again, please?

请再说一遍好吗？

If I might just say something...

要是叫我说…

You're a great help, I must say!

我得说，你可没少帮忙！