Sunday是一个名词，它在句子的任何地方都要大写。the man often goes out to play volleyball with his friends on Sunday.这个人经常在星期天和他的朋友出去打排球。
I like Sunday very much because I can have a rest on that day.我非常喜欢星期天，因为在那天我可以休息。
sunday是名词
它的意思是星期天，礼拜日
Sunday is the first day of the week
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