Why you didn’t come to school?
or
Why didn’t you come to school?
Sir, please tell me the time…
The exactly to say greeting Good Morning ( start what time until …) Maybe from 12 am to 11 am.
Start from morning until night, Please
is it true?
Greetings consists of Good morning, good day, good afternoon, good evening, good night.
Are good day and good afternoon same?
“I wanted to know - why you didn’t come to school yesterday”
“Why didn’t you come to school yesterday”
Say “good morning” until noon.
Most greetings are “Hello. Hi. What’s up? How’s it going.” Good morning, good afternoon, and good evening are also greetings. “Good day” is not really used in the US.
“Good night” is what you say when you (or the other person) goes to bed.
Nice Tips 