昨天早上用英语可以说 "yesterday morning". 来源是英文中描述时间的常见表达方式。例如：

I woke up early yesterday morning. (我昨天早上早早醒来。)

I had a meeting yesterday morning. (我昨天早上有个会议。)

Yesterday morning was cold and foggy. (昨天早上很冷，还有雾。)