SIMPLE PAST TENSE

1. (+) Coronavirus disease 2019 (COVID-19) is an infectious disease caused by severe acute respiratory syndrome coronavirus
     (-) Coronavirus 2019 (COVID-19) is an infectious disease that is not caused by acute respiratory syndrome coronavirus 2.

     (?) Is Coronavirus 2019 (COVID-19) a contagious disease caused by acute respiratory syndrome coronavirus 2?

2. (+) The disease was first identified in 2019 in Wuhan, Central China.

    (-) This disease was first identified not in 2019 in Wuhan, Central China.

     (?) was this disease first identified in 2019 in Wuhan, Central China?

3. (+) Common symptoms include fever, cough, and shortness of breath.

    (-) Common symptoms do not include fever, coughing, and shortness of breath.

    (?) Are fever, coughing, and shortness of breath including common symptoms?

4. (+) On March 20, 2020, the death rate per number of cases diagnosed was 4.1% 

    (-) On March 20, 2020, the death rate per number of cases diagnosed was not 4.1%;

    (?) Was the March 20, 2020, death rate per number of cases diagnosed at 4.1%?

5. (+) This virus usually spreads from one person to another through respiratory drops produced during coughing.

     (-) This virus does not usually spread from one person to another through respiratory droplets produced during coughing.

     (?) Does this virus usually spread from one person to another through respiratory drops produced during coughing?

6. (+) It can also spread from touching a contaminated surface and then touching someone's face.

     (-) It cannot spread from touching a contaminated surface and then touching someone's face.

     (?) Can it spread from touching a contaminated surface and then touching someone's face?

7. (+) The infection can also be diagnosed from a combination of symptoms, risk factors and a chest CT scan showing features of pneumonia.

    (-) Infection cannot be diagnosed from a combination of symptoms, risk factors and chest CT scan that shows pneumonia features.

     (?) can the infection be diagnosed from a combination of symptoms, risk factors and chest CT scans that show features of pneumonia?

8. (+) Recommended measures to prevent infection include frequent hand washing, social distancing.

     (-) Steps that are not recommended to prevent infection include frequent hand washing, maintaining social distance.

     (?)Are the recommended steps to prevent infection including frequent hand washing, maintaining social distance?

9. (+) The person should go to a referral hospital for treatment and quarantine
 (-) The person should not go to a referral hospital for treatment and quarantine
 (?) Should the device go to a referral hospital for treatment and quarantine?
 10. (+) I hope that we all stay awake
 (-) I didn't hope that we all stayed awake
 (?) Did I hope that we all stay awake?