Ответ:

a)How long has she been learning to drive?

b)How many times has she took the test so far?

2) Fred is a filmmaker

a) How long has he been making films?

b) How many films has he made

3) Greg works in a bank

a) How long has he been working there?

b) How many other jobs has he had?

4) Ellen and David have decided to get married

a)How long have they been going out together?