Write the questions for these answers. They are all questions ending in a preposition.

Who does he work for?
He works for Microsoft.

They export to the Middle East,

He bought it for his girlfriend.

They study with their friends.

This song is by U2

It's for controlling the temperature.

They make them from plastic.

They need it by Tuesday.

She got a letter from Bill.

1. Who does he work for?
Explanation: This question is asking about the person or organization that he is employed by.
Step-by-step solution: Change the statement "He works for Microsoft" into a question by using the preposition "for" at the end: Who does he work for?

2. They export to the Middle East.
Explanation: This question is asking about the destination or location where they are exporting their products.
Step-by-step solution: Change the statement "They export to the Middle East" into a question by using the preposition "to" at the end: Where do they export to?

3. He bought it for his girlfriend.
Explanation: This question is asking about the recipient or beneficiary of the item he purchased.
Step-by-step solution: Change the statement "He bought it for his girlfriend" into a question by using the preposition "for" at the end: Who did he buy it for?

4. They study with their friends.
Explanation: This question is asking about the people with whom they study.
Step-by-step solution: Change the statement "They study with their friends" into a question by using the preposition "with" at the end: Who do they study with?

5. This song is by U2.
Explanation: This question is asking about the artist or creator of the song.
Step-by-step solution: Change the statement "This song is by U2" into a question by using the preposition "by" at the end: Who is this song by?

6. It's for controlling the temperature.
Explanation: This question is asking about the purpose or function of "it".
Step-by-step solution: Change the statement "It's for controlling the temperature" into a question by using the preposition "for" at the end: What is it for?

7. They make them from plastic.
Explanation: This question is asking about the material or substance used to make "them".
Step-by-step solution: Change the statement "They make them from plastic" into a question by using the preposition "from" at the end: What are they made from?

8. They need it by Tuesday.
Explanation: This question is asking about the deadline or specific time when they need "it".
Step-by-step solution: Change the statement "They need it by Tuesday" into a question by using the preposition "by" at the end: When do they need it by?

9. She got a letter from Bill.
Explanation: This question is asking about the sender or source of the letter.
Step-by-step solution: Change the statement "She got a letter from Bill" into a question by using the preposition "from" at the end: Who did she get the letter from?