Sorry

Adding "sorry" to anything you say will make you sound more polite. 

Don't overdo it though.  Too many "sorrys" and you will not sound sincere.

Learn English for Beginners Tip

All of these expressions are polite but with the wrong tone they could be interpreted as rude.  

Remember to always focus on your tone.  

Also, when speaking face to face, your body language and facial expressions will help you (or hurt you).

Your English isn't the Problem

If you are in a car, or in a loud restaurant then don't be surprised if you have a harder time understanding or following a conversation.  

If you can not hear what is being said, then you obviously will not understand it.  

This is for everyone: Native English speakers included!

It is ok!

If you are speaking to someone and you do not understand them or the subject it is ok to say that you do not understand or admit that you do not know.

Being able to say you are lost or confused is difficult sometimes but it will show someone that they need to explain something in a different way, slow down or just use different vocabulary or expressions.