hello teaches,i＇m so glad to see you in such a good day morn

不太对
Hello teacher(s), I'm so glad to see (you) (on) such a good (day/morning)
good day和good morning 意思相同所以选一个就行了
要用day的话good day是可以的 但是morning的话,用see you on such a great morning可能会好一点
因为是时间天气,所以不能用in只能用on
多一点: 一个老师的话就可以用you 但是很多老师的话就用all of you会更好