Формы Continuous (Present, Past, Future) и Perfect (Present, Past,
Future) в действительном (Active) и страдательном (Passive) залогах.

Перепишите предложения и переведите их. Выпишите сказуемые и
укажите их видовременные формы.
Пример-Model: The train has already arrived at the station. Поезд уже прибыл на станцию. has arrived – Present Perfect Active (to arrive)

1. The Alaska state government has proposed to construct a railroad, which will link the rail networks of the US, Canada and Russia via a 90km rail tunnel beneath the Bering Straits.

2. The underground railway is the quickest, safest, most reliable and comfortable means of public transport, which is currently operating in 80 cities all over the world.

3. Sleeping cars were being used on American railroads since the 1830s; however, early sleepers were very uncomfortable for traveling over long distances.

4. It has been calculated that East Japan Railway Company sells 1,000 tons of tickets
annually. These tickets are now being collected and re-used in the manufacture of
cardboard and toilet paper.