Tú vs. Usted: Informal vs. Formal

The difference between tú and usted is that Tú is informal (for talking to your friends) and Usted is formal (for talking to an adult). 

- the way you use the words can change the whole meaning of the sentence

• you dont always have to say tú or usted after you ask a question
• you only have to say it when the word is not in parenthesis 

These are some examples of how to use the words

click here for a real life situation of how to use tu vs usted.