Simple past tense from my previous Blog

Simple past tense from my previous Blog
and Negative & Interrogative tense

1. (+) COVID-19 is a new species discovered in 2019
 (-) COVID-19 new species not discovered in 2019
 (?) Was COVID -19 discovered in 2019?

 2. (+) In 2019 this virus (COVID-19) has been identified in humans
 (-) in 2019 this virus (COVID-19) has never been identified in humans
 (?) Has this virus been identified in humans in 2019?

 3. (+) The first case was found in Wuhan City in China.
 (-) The first case was not found in Wuhan city of China
 (?) where was the first case found?

 4. (+) Last year, this virus had spread to more than hundreds of people in China.
 (-) last year, this virus has not spread to more than hundreds of people in China.
 (?) Has this virus spread to more than hundreds of people in China last year?

 5. (+) (WHO) issued a travel ban to go to the city of Wuhan in China.
 (-) (WHO) has not yet issued a travel ban for the city of Wuhan in China.
 (?) who issued a travel ban to go to Wuhan in China?

 6. (+) in 2002 and 2003, an aggressive corona virus called SARS-CoV spread in 30 countries.
 (-) in 2002 and 2003, an aggressive corona virus called SARS-CoV did not spread in 30 countries.
 (?) Did in 2002 and 2003, an aggressive corona virus called SARS-CoV spread in 30 countries?

 7. (+) In 2012, the Middle East corona virus that attacks the respiratory tract (MERS-CoV) was discovered in the Arabian Peninsula.
 (-) In 2012, the Middle East corona virus that attacks the respiratory tract (MERS-CoV) was not found in the Arabian Peninsula.
 (?) In what year was the Middle Eastern corona virus found that attacks the respiratory tract on the Arabian peninsula?

 8. (+) In various parts of the world, more than 8,000 people contract the virus, around 1,000 people die.
 (-) In various parts of the world, more than 8,000 people were not infected with the virus, about 1,000 people died.
 (?) what is the number of people infected with this virus and the number of people who died in various parts of the world?

 9. (+) Although effective in preventing exposure to germs, the use of this mask can still reduce the risk of spreading infectious diseases, including Corona virus infections.
 (-) Although not completely effective in preventing exposure to germs, the use of this mask can still reduce the risk of spreading infectious diseases, including Corona virus infections.
 (?) is the use of Masker effective in preventing exposure to germs, and can reduce the risk of spreading infectious diseases, including Corona virus infections?

 10. (+) Avoid contact with animals that have the potential to transmit the corona virus
 (-) Avoid contact with animals that do not have the potential to transmit the corona virus
 (?) what should be avoided from corona virus transmission?