前面用介词on,例如:

1、Your suit will be ready for collection on Tuesday.你的西服可在星期二领取。

2、New York holds its primary election on Tuesday.纽约州将在星期二举行预选。

3、I can't come to dinner on Tuesday ─ I'm otherwise engaged.我星期二不能来参加宴会——我另有安排。

Tuesday前介词用on还是in

如果单独Tuesday就是加on

如果tuesday后面加了morning什麽的就要注意要跟后面的比如

inTuesdaymorning,atTuesdaynight