Have to

Have to/has to/had to = (não) ter de fazer

Meaning: Something is/was necessary: you have/had no choice.

+ Fernanda gets very tired because she has to work the whole day.
- She doesn't have to get a bus any more.
? Does she have to work from Monday to Friday? Yes, (she does).
? Do they have to work at weekends too? No, (they don't).
? Did she have to study at weekends when she was a student?
Yes, (she did). She had to study a lot. / No, (she didn't)