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 tell me what this word means? 2)      Would you mind if I borrowed your pen? 3)      Could you repeat that, please? 4)      Could you please tell him(her) that...