Определить время и залог сказуемого.

1. Mass is measured in grams or kilograms and time is measured in seconds and hours

2. The photoelectric effect was discovered by Heinrich Hertz in 1887

3. Galileo lived at a time when the human spirit was waking after a thousand years of sleep

1. Mass is measured (Present Simple Passive) in grams or kilograms and time is measured in seconds and hours

2. The photoelectric effect was discovered (Past Simple Passive) by Heinrich Hertz in 1887

3. Galileo lived (Past Simple Active) at a time when the human spirit was waking (Past Continuous Active) after a thousand years of sleep