以下是一些可以用以询问“twice a week”的提问方式：
1. How often do you do it?
2. How frequently do you do that?
3. How many times a week do you do it?
4. Is it done twice a week?
5. Can you tell me how often it happens?
6. How many times per week is it?
7. How often is it scheduled?
8. Is this activity done every two days?
9. How many times a week does this occur?
10. How often does this take place?
