I want to take some pieces of paper.(变单数句)

I want to take a piece of paper

I want to take a piece of paper.
piece就是paper的数量词
把some改成a 即可

I want to take a piece of paper.
（a piece of 是“一张”的意思，改为单数时，将“pieces of”前的数词改为"a"，把“pieces”去掉"s"即可）

I want to take a piece of paper
因为paper是不可数名词，所以它的复数变成单数就把some改成a，pieces改成piece就行了