紙を一枚

one sheet of paper

→ 紙
phrase Rare #40,869
one sheet of paper 一枚 is the counter used for thin, flat objects such as sheets of paper. The particle を marks the paper as the object being requested or handled.
JA: 紙を一枚ください。
EN: Please give me one sheet of paper.

書く紙を一枚ください

Please give me a sheet of paper to write on.

私に紙を一枚下さい

Please give me a sheet of paper.

紙を一枚ずつ取ってください

Please take one sheet of paper at a time.

紙を一枚下さい

Please give me a sheet of paper.