书上有On Tuesday mornings 的写法那是不是要写成On a Tuesday morning才对?On Tuesday morning正确吗?

书上有On Tuesday mornings 的写法那是不是要写成On a Tuesday morning才对?On Tuesday morning正确吗? 是on the tuesday 还是on tuesday on mondays,I wear the red socks.On____(Sundays/Tuesday)Tuesday后面也有s what ()he ()on Tuesday? What are you doing Tuesday afternoon.为什么不加on?（书上原句）为什么不在doing后加on? On Tuesday and Thursday evening ,. What do we have on Tuesday?Tuesday是否加S on Tuesday afternoon是啥意思 What's the subject on Tuesday? what does he do on tuesday回答 On Tuesday she__ in the orchestra. we have science on Tuesday and Thursday对 on Tuesday and Thursday提问 They have maths on Tuesday and Friday.对on Tuesday and Friday提问 We usually have P.E.on Tuesday.(对划线部分提问)划的是on Tuesday She made a dress for her doll on Tuesday.对划线提问,划线on Tuesday We usually have P.E.on Tuesday.(对划线部分提问)划的是on Tuesday Mike is going to the concert on Tuesday afternoon.__________ _________ Mike __________ on Tuesday afternoon? 但是我在星期二很忙的翻译But I am on Tuesday very busy.有错误吗