对同学和老师打招呼的英语句子如下：
对老师
Hello, teacher.
Hi, teacher.
Hello, nice to meet you!
Hi, nice to meet you!
It's a pleasure to meet you!
I'm so glad to meet you!
Good morning, teacher.
Good afternoon, teacher.
Good evening, teacher.
How are you today, teacher？
How have you been recently, teacher？
对同学
Hello, classmate.
Hi, classmate.
How are you doing today？
What's up？
Not much, just the usual. And you？
I'm doing well, thanks. And you？
Nice to see you again!
Have a great day!
这些句子适用于不同的场合和情境，可以根据具体需要选择合适的问候语。例如，早晨见面时可以说“Good morning, teacher.”或“Good morning, classmate.”，下午见面时可以说“Good afternoon, teacher.”或“Good afternoon, classmate.”，晚上见面时可以说“Good evening, teacher.”或“Good evening, classmate.”。希望这些句子对你有所帮助!
