Переделайте предложения из действительного залога в страдательный. 1. he is writing a letter at the moment. 2. john was preparing report all day yesterday. 3.we are learning grammar now. 4. at present mankind is making considerable investments to eliminate air pollution. 5. today the changes in the global climate and water balance are bringing about serious changes in the environment. 6. many scientists are constantly carrying out experimental work to solve the problem of environment protection. 7. the company is making plans for the future.

1 The letter is being written by him at the moment.
2 Report was being prepared by John all day long.
3 Grammar is being learnt ( by us) now
4 Considerable investments are being made at present to eliminate air pollution.
5 Serious changes in the environment are being brought today by the global climate and water balance.
6. Experimental work is being constantly carried out by many scientists to solve the problem of environment protection.
7. Plans for the future are being made by the company.