星期六早上用英语可以说作 "Saturday morning". 来源是 "Saturday" 星期六的英文，和 "morning" 早上的英文。

一些英文例句可以是：

I usually have a big breakfast on Saturday mornings.

My favorite way to start a Saturday morning is with a cup of coffee and a good book.

I like to go for a run on Saturday mornings before it gets too hot outside.

希望这些回答对您有帮助。