1. формы continuous (present, past, future) и perfect (present, past, future) в действительном (active) и страдательном (passive) залогах. (b) перепишите предложения, поставив глагол в нужную форму, и переведите их. 1. within five years, the railway (to carry – past continuous active) over seven million passengers annually. 2. nowadays, crossties (to make – present simple passive) of wood, concrete, steel. in some countries, plastic sleepers (to experiment – present continuous passive) with. 3. the construction of the railway bridge (to complete – past perfect passive) by the beginning of the navigation season. 4. switzerland (to occupy – present simple active) a special place in the history of railway electrification, because its engineers (to make – present perfect active) a great contribution to this field and almost all its railways (to electrify / completely – present simple passive). 5. the train (to delay – past simple passive) because a tree (to fell – past perfect active) across the line.