昨天是星期几昨天是星期三用英语怎么说

"Yesterday was Wednesday" 用英语说就是 "Yesterday was Wednesday"。

星期几的英语表达来源于古罗马神话。星期天是 "Sunday"，命名自太阳神叫"Sol"。星期一是 "Monday"，命名自月亮女神叫 "Moon"。星期二是 "Tuesday"，命名自战神叫 "Mars"。星期三是 "Wednesday"，命名自木星叫 "Mercury"。星期四是 "Thursday"，命名自雷神叫 "Jupiter"。星期五是 "Friday"，命名自女巫叫 "Venus"。星期六是 "Saturday"，命名自宙斯叫 "Saturn"。

例句：

Yesterday was Wednesday. 昨天是星期三。
I will see you on Wednesday. 我会在星期三见到你。
Wednesday is the middle of the week.星期三是一周的中间。