Two new contracts have been signed this week . Вопрос: When were two new contracts signed ? - это классический случай, здесь все верно, дело в том что специальные вопросы, которые начинаются с when предполагают Past Simple (Active или Passive, но Past Simple) Учебники говорят, что вопрос с When не бывает в Present Perfect! поэтому в первом предложении тоже по идеальной схеме мы должны написать When were many guests invited to my birthday party? при ответе Many guests have been invited to my birthday party today. Цитата из учебника английского языка "В Present Perfect нельзя задать вопросы, которые начинаются с When или его производного At what time, так как в ответе на этот вопрос будет содержаться упоминание о дате". ( я Вам в личку скину ссылочку на эту страничку , и Вы разберетесь)
1. The aim of positive economics is to explain how society makes decisions about consumption, production, and exchange of goods. 2. Whatever our political persuasion, whatever our view about what we would like to happen or what we would regard as 'a good thing', in the first instance we have to be concerned with how the world actually works. 3. Although competent and comprehensive research can in principle resolve many of the outstanding issues in positive economics, no corresponding claim can be made about the resolution of disagreement in normative economics. 4. The elderly have very high medical expenses compared with the rest of the population, and the government should subsidise health bills of the aged. 5. It is a statement about how the world works, and we can imagine a research programme that could determine whether or not it is correct. 6. The second part of the proposition - the recommendation about what the government should do - could never be 'proved to be correct or false by any scientific research investigation. 7. Many people can share this subjective judgement, for example those people who believe that all citizens alive today should be able to purchase roughly equal amounts of luxury and recreational goods after paying for the necessities of life. 8. But other people might reasonably disagree. 9. You might believe that it is more important to devote society's scarce resources to improving the environment.
1. Sailed
2. Received
3. Found
4. Was
5. Didn’t have
6. Crew were climbing
7. Run
8. Were searching
9. Were tiering
10. Broke out
11. Rushed
12. Exploded
13. Sinked
14. Happened
15. Existed