how to ask your teacher

Since this is a dialogue, all sentences must be quoted and separated by a blank line.

"Excuse me sir I don’t understand it. Can you please repeat again1?"

"Yes what which line should I explain is it?"

" Number Line 3 of on this slide.  ’s can’t I don't understand it."  about manager works.2

"OK i will I shall repeat it.  again.

1.  Redundant.  Repeat means again.

2.  I don't understand this but it is not important in this conversation.

how to ask your teacher

Excuse me sir! I don’t understand it. Can you repeat this again for me, please?
--yes, what line should I explain?
Its number 3 of this slide’s, don't understand about manager's works.
--ok! i will repeat again.

how to ask your teacher

1.Excuse me sir I don’t understand it. Can you repeat again?
2.--yea what line should I explain?
3.Number 3 of this slide’s can’t understand about manager works.
4.--ok i will repeat again.

1.Excuse me, sir, I don't understand it. Can you repeat it again? Comment: typically, "it" in "repeat it" would not be omitted.

2. Yes, what line should I explain? Comment: "Yea" is Old English.

3. Number 3 of this slide about, 'manager works,' I don't understand. Comment: To say, "I can't," means that you are unable, or not capable, of understanding. 

4. All right, I will repeat again. Comment: "All right" is more formal than "OK".  "I" , first person prounoun, is always capitalized in English.