The first sentence has the proper punctuation.
2: For fifteen years.
3: How long did your father work in the bank?
4: For five years.
5: How long have you had the same hairstyle?
6: Since I was about six.
7: How long have you known your best friend for?
8: For three years.
9: How long did your class study english for?
10: Since we were at primary school.
Sorry, I can’t do the second but here’s the first!!!
