Ребят, срочно, нужна помощь!

2)How long has Mary been teaching French
She has been teaching French since 1990.
3)How long have the robbers been hiding in a farmhouse
They have been hiding in a farmhouse for a week.
4)How long has Peter been making model planes
He has been making model planes since 1992.
5)How long has Julie been playing guitar
She has been playing guitar for four years.
6)How long have the children been watching TV
They have been watching TV for two hours.