Запишите предложения. выпишите из них сказуемые, определите их видо-временные формы и залог. переведите, обращая особое внимание на перевод пассивных конструкций.
1. lectures in up-to-date mining techniques were always attended by a great number of students and young scientists.
2. since the 1880s, coal has been widely used to generate electricity.
3. coal mining has had a lot of developments over the recent years.
4. they will have completed the construction of the deep-level tunnel by autun.

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