Romanian - my very first lesson

These are notes from my session with my italki teacher.
http://www.italki.com/teacher/T009865975.htm
This is what I learned:
lecția întîi first lesson
Cum salutăm? cum: how a saluta: to greet
Bună dimineața! Good morning!
Bună ziua! Good day!
Bună seara! Good evening!
Noapte bună! Good night!
La revedere! Good bye!
Pe curînd curând! See you soon!
Pe mîine mâine! See you tomorrow! "

1. "Î" is used at the beginning or at the end of the words. For example: "încă" - "yet", "a înota"
 - "to swim", "a coborî" - "to get down", "to get off" etc.

2. "Â" is used in the middle of the common words. For example: "a cânta" - "to sing", "a mânca" - "to eat" etc.

2. There are some cases when "î" is also used in the middle of the words but just if the word has a prefixe at the beginning of the word. For example: "a preîntâmpina" - "to avert". In this case the word is formed by "pre" and "întampina". As you can see, there are used "î" and "â" also because of the prefixe. "Pre" and "întâmpina" are combined because de sense of the word changes with that prefixe. "A preîntâmpina" means "to avert" and "a întâmpina" means "to come against" or "to meet with" so that prefix is necessary. There are not many examples like this.

Cum cerem ceva? How to ask for something. (cere: ask ceva: something)
Cum mulțumim? How to thank. (mulțumim: thanks)
Un bilet, vă rog.
Poftiți.
Mulțumesc.
Cu placere. A ticket, please.
Here you are.
Thank you.
You are welcome. (with pleasure)

Very good! Keep up the good work!