a) 1) It was necessary to send it urgently. 2) It was a convenient train. 3) It was interesting to read this article. 4) It was an important experiment. 5) It was not difficult to sign the contract. 6) It was impossible to carry on trade in the modern world without using money. 7) It was impossible to dissolve the substance in water. 8) It was formerly believed that all heavy objects fell faster than light objects. 9) It was now well established in economics that innovations are absolutely central to development, growth, and well-being. 10) It was important to know these facts.
b) 1) It will be necessary to send it urgently. 2) It will be a convenient train. 3) It will be interesting to read this article. 4) It will be an important experiment. 5) It will not be difficult to sign the contract. 6) It will be impossible to carry on trade in the modern world without using money. 7) It will be impossible to dissolve the substance in water. 8) It will be formerly believed that all heavy objects fell faster than light objects. 9) It will now be well established in economics that innovations are absolutely central to development, growth, and well-being. 10) It will be important to know these facts.
c) 1) It is not necessary to send it urgently. 2) It is not a convenient train. 3) It is not interesting to read this article. 4) It is not an important experiment. 5) It is difficult to sign the contract. 6) It is possible to carry on trade in the modern world without using money. 7) It is possible to dissolve the substance in water. 8) It is not formerly believed that all heavy objects fell faster than light objects. 9) It is not now well established in economics that innovations are absolutely central to development, growth, and well-being. 10) It is not important to know these facts.
a)
1) It was necessary to send it urgently.
2) It was a convenient train.
3) It was interesting to read this article.
4) It was an important experiment.
5) It was not difficult to sign the contract.
6) It was impossible to carry on trade in the modern world without using money.
7) It was impossible to dissolve the substance in water.
8) It was formerly believed that all heavy objects fell faster than light objects.
9) It was now well established in economics that innovations are absolutely central to development, growth, and well-being.
10) It was important to know these facts.
b)
1) It will be necessary to send it urgently.
2) It will be a convenient train.
3) It will be interesting to read this article.
4) It will be an important experiment.
5) It will not be difficult to sign the contract.
6) It will be impossible to carry on trade in the modern world without using money.
7) It will be impossible to dissolve the substance in water.
8) It will be formerly believed that all heavy objects fell faster than light objects.
9) It will now be well established in economics that innovations are absolutely central to development, growth, and well-being.
10) It will be important to know these facts.
c)
1) It is not necessary to send it urgently.
2) It is not a convenient train.
3) It is not interesting to read this article.
4) It is not an important experiment.
5) It is difficult to sign the contract.
6) It is possible to carry on trade in the modern world without using money.
7) It is possible to dissolve the substance in water.
8) It is not formerly believed that all heavy objects fell faster than light objects.
9) It is not now well established in economics that innovations are absolutely central to development, growth, and well-being.
10) It is not important to know these facts.