The detailed answer provides the sentences from transformation exercises in English with the right structure changes.
a. Are you going to the seminar this weekend? (I am.)
b. She didn't invite me, either. (She invited me, as well.)
c. Can he play the guitar well? (Is he able to play the guitar well?)
d. By the end of 2050, the population of the world will reach eight billion.
e. My neighbor said, "Did you buy a new car yesterday?"
f. Are all the questions attempted by her? (Are all the questions attempted by her?)
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