直接叫“老师”teacher是很不礼貌的
上英语课的时候
老师一进门,班长一声令下
我们就齐刷刷地喊
Good morning teacher！
喊了这么多年
竟然没人告诉我们是错的！
Ouisch
In the US, it's common for very young students (kindergarten, first grade) to address their instructor simply as "Teacher." But by the end of first grade they're expected to call the teacher by name (Mr. Smith, Ms. Jackson, etc.) If a teacher has a particularly long surname, they might allow students to shorten it in some way; that is, Mrs. Wojadubakowski might encourage her students to call her "Mrs. W."
在美国，会见到非常小的学生(幼儿园、一年级)简单地称呼他们的老师为Teacher。但是在一年级结束的时候，他们应该称呼老师的名字(史密斯先生，杰克逊女士等)，如果老师的姓氏特别长，他们可能允许学生用某种方式缩写;也就是说Wojadubakowski夫人可能会叫她的学生称她为W夫人。
Addressing a teacher as "Teach" is pretty impudent, but I can imagine that in this day and age there are some instructors who would find "Teach" a welcome alternative to "Butthead" or some other sobriquets your Blackboard Jungle-type of kids would use.
用“Teach”来称呼老师是相当无礼的，但我可以想象，在这个时代，有些教师会发现“Teach”是一个受欢迎的替代“Butthead”等外号的被没有纪律的调皮孩子使用的绰号。
那么到底应该怎么称呼你的老师？
When in doubt, it’s good to go with the more formal title first.
当你不确定时，最好先用更正式的头衔。
If a teacher feels comfortable with something less formal, then it’s up to them to decide and let you know.
如果老师倾向于更舒服的说法，那就由他们来决定并让你知道。
As a general rule, here are a couple of good options for what you could call your teacher as the student.
一般来说，这里有一些很好的作为学生称呼你老师的选择。
For University
大学里
Miss
Professor
Mrs.
Mr.
Dr. (if they have an advanced degree 如果他们有博士学位)
For Other Schools (Younger Students)
其他学校（更年轻的学生）
Miss
Mrs.
Mr.
对于有些我们不清楚名字的时候，
也可以说：
“Excuse me, Sir”
或 “Pardon me, Madam/Ma'am.”
好啦，今天的小知识点，你学会了嘛？
REF：www.usingenglish.com/forum/threads/88833-What-if-I-just-say-quot-teacher-quot-instead-of-teacher-s-name-is-it-rude
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