I found a question in an English book for 12th grade about sentences transformations. The book called "Action Pack" by Cheryl Pelteret, Liz Kilbey and Judith greet. It is in Jordan Kingdom in the middle east.
The question is "Complete the second sentence so that it has the same meaning as the first".
The third sentence is "It is normal for me now to get up early to study" they transformed it to "I am used to getting up early to study now".
They used "be used to". I don't know what just happened here, is there a rule in English talks about transforming sentences from "It is familiar" or "It is normal" to "be used to" sentences? I didn't find anything like that on Internet! So what is this rule?