Question

1. Change into affirmative.
a. They didn't know how to use a telescope before the class.
b. I didn't watch the teacher's explanation about comets.
c. She doesn't believe there's life on other planets.
d. My teacher didn't explain about gravity in the last science class,
e. The American astronauts weren't on a mission in space.
f. She wasn't talking to the people about the city pollution.
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Answer 1

a- They knew how to use a telescope before the class.

b- I watched the teacher’s explanation about comets.

c- She believes there’s life on other planets

d- My teacher explained about gravity in the last science class.

e- The American astronauts were on a mission in space

f- She was talking to the people about the city pollution

Espero ter ajudado :D