Front

used to

Back

indicates a past habit or state

Front

got used to

Back

became accustomed to something

Front

didn't use to

Back

indicates a past habit that was not present

Front

be used to

Back

to be familiar with something

Front

I am used to

Back

I am familiar with or accustomed to something

Front

I got used to

Back

I became familiar with or accustomed to something