Answer the following questions using the negative form of the present perfect tense
1.Have scientists found an inexpensive substitute for fuel oil?
2.Has humankind completely conquered nature?
3.Have scientists uncovered all the secrets of the oceans?
4.Have we solved all the mysteries of space?
5.Have doctors found a cure for cancer? 6.Have psychologists found answers to the baffling questions of adolescents?
7.Have astronauts found the answers to all of our questions about Mars?
8.Have we developed the use of solar beat?
9.Have many people believed in flying saucers?
10.Has the army identified the UFOs?
1.Have scientists found an inexpensive substitute for fuel oil?
2.Has humankind completely conquered nature?
3.Have scientists uncovered all the secrets of the oceans?
4.Have we solved all the mysteries of space?
5.Have doctors found a cure for cancer? 6.Have psychologists found answers to the baffling questions of adolescents?
7.Have astronauts found the answers to all of our questions about Mars?
8.Have we developed the use of solar beat?
9.Have many people believed in flying saucers?
10.Has the army identified the UFOs?
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Answer:
1.Yes
2.Luckily no!but they conquer the weather
3.Probably Yes
4.No and maybe not
5.Yes,the medicine that can cure the cancers,but only doctors knows
6.its a big NO
7.No,not really
8.Maybe
9.maybe,and im one of them
10.Yes
Explanation:
base on my own knowledge:))