Can you maybe (do something)?

This is an extra-polite way to ask someone to do something. You might use this phrase with someone you don’t know well, or if you’re a little uncomfortable asking. 

Can you maybe make sure the dishes are completely clean when you wash them?

Can you maybe let me know how many people you’re bringing?

turn (something) down

This means to reduce something, usually sound:

My mom always turns down the TV when I’m watching it. 

It’s also often used for air conditioning and heat:

Whoa, you need to turn down the AC. It’s freezing in here!

just a little

Say this when you’re asking for a very small amount of something.

A: Do you want some pepper on that?

B: Just a little.