Ask people to help you in these situations. Example:You can't hear
what the teacher is saying very well.-Could you speak louder,please?
 
1)You don't know what this word means. 2)You can't find your pen
to write down a word. 3)You want to know the time. 4)You didn't
understand what your parther said. 5)You want to leave a message for
your friend.

1) Could you explain me the meanings of these words, please?

2) Could you give me a pen, please?

3) Could you tell me the time, please?

4) Could you repeat please?

5) Could you transmit my message, please?