Given a question, generate a paraphrase of that question wihout changing the meaning of it. Your answer should reword the given sentence, but not add information to it or remove information from it. The answer to your question should be the same as the answer to the original question.

Question: what were the years abraham lincoln was president?
abraham lincoln was president in which years?

Question: worlds highest mountain peak?
what is the worlds highest mountain peak?

Question: many people live in the us?

population of people living in the us?