1. Did they have their breakfast at the university dining-room?
They didn't have their breakfast at the university dining-room.
2. Did he do the translation without any difficulty?
He didn't do the translation without any difficulty.
3. Did you ski in the country yesterday?
I didn't ski in the country yesterday.
4. Did Agatha Christie write a lot of detective stories?
She didn't write a lot of detective stories.
5. Did my father buy a new adventure story yesterday?
My father didn't buy a new adventure story yesterday.
1. The greatest difficulty to the practical use of solar power: the scientists will overcome the production of energy when the sun is not shining. Наибольшая трудность при практическом использовании солнечной энергии: ученые преодолеют производство энергии тогда, когда солнце не светит.
will overcome - Future Simple, Active Voice, inf - to overcome
is not shining - Present Continuous, Active Voice, inf - to shine
2. Engineers use the gas turbine in such application as electric power generation. Инженеры используют газовую турбину в таких областях, как производство электроэнергии.
use - Present Simple, Active Voice, inf - to use
3. A decrease in the pressure drop through the turbine adversely affects the turbine efficiency. Снижение перепада давления в турбине отрицательно сказывается на эффективность турбины.
affects - Present Simple, Active Voice, inf - to affect
