Нужна помощь с английским

1 Bob has been working for his dad's company since he graduated from college last summer.
2 Doug has been working for an architect firm for a year.
3 Emma and Lucy have been studying marketing since September last year.
4 Charlie has been training as a helicopter pilot for three years.
5 Andrey and Vadim both have been doing a training course with Aeroflot for eighteen months.