Перепишите следующие предложения, определите в каждом из них видовременную форму и залог глагола-сказуемого. переведите предложения на язык. 1) many companies are trying to establish joint ventures. 2) efficiency has been improved by e-mail for communication. 3)salary costs have gone up since the last year. 4) this option will not involve any redundancies and shift work. 5) many customers backed out of contracts when delivery dates were not kept.