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She has known how to play the piano for 5 years.

• She didn’t play the piano 5 years ago.
• She started to play the piano 5 years ago.
• She played the piano 5 years ago.
• The last time she played the piano was 5 years ago.

Conan said to me, “If I were you, I would read different types of books in different ways.”

• Conan ordered me to read different types of books in different ways.
• I said to Conan to read different types of books in different ways to me.
• I read different types of books in different ways to Conan as he told me.
• Conan advised me to read different types of books in different ways.

Every student is required to write an essay on the topic.

• Every student might write an essay on the topic.
• Every student must write an essay on the topic.
• They require every student can write an essay on the topic
• Every student should write an essay on the topic.

His parents are away on holiday. He really needs their help now.

• As long as his parents are at home, they will be able to help him.
• He wishes his parents were at home and could help him now.
• If his parents are at home, they can help him now.
• If only his parents had been at home and could have helped him.

Helen wrote a novel. She made a cowboy film, too

• Helen wrote not only a novel but also made a cowboy film.
• Helen both wrote a novel as well as made a cowboy film.
• Helen either wrote a novel or made a cowboy film.
• Not only did Helen write a novel but she also made a cowboy film.

We have been cooking for the party for four hours.

• We didn’t start cooking for the party until four.
• We started cooking for the party four hours ago.
• We have four cooks for the party
• Cooking for the party will be done in four hours

"Don't forget to submit your assignments by Thursday," said the teacher to the students.

• The teacher reminded the students to submit their assignments by Thursday.
• The teacher allowed the students to submit their assignments by Thursday.
• The teacher ordered the students to submit their assignments by Thursday.
• The teacher encouraged the students to submit their assignments by Thursday.

I’m sure that they had practiced hard for the games as they won a lot of medals.

• They couldn’t have practiced hard for the games as they won a lot of medals
• They must have practiced hard for the games as they won a lot of medals
• They shouldn’t have practiced hard for the games as they won a lot of medals
• They might have practiced hard for the games as they won a lot of medals.

Jenifer rejected the job offer. She now regrets it.

• Jenifer regrets not having rejected the job offer.
• If only Jenifer didn’t reject the job offer.
• Jenifer wishes she hadn’t rejected the job offer.
• Jenifer regrets to reject the job offer.

We couldn't solve the problem until our teacher arrived.

• Not until we solved the problem could our teacher arrive.
• When our teacher arrived, we solved the problem.
• Until our teacher arrived, we were able to solve the problem.
• Not until our teacher arrived could we solve the problem.