When you want to ask a question you say...
Can I ask something?/ I have a question.
When your teacher speaks very fast you say...
Could you speak more slowly, please?
When you have problems with you internet you say...
I have problems with my internet.// My internet is not working well.
You say this when you teacher speaks very low.
Could you speak louder?
You say this when you can't hear what the other person says.
I Can't hear you.
When you didn't understand something the first time you say...
Can you repeat that?/ Cay you say it again?