pencils.铅笔是pencil,在pencil后面加s就是铅笔的复数pencils.this is a pencil.这是一支铅笔。

there are 3 pencils in the box.铅笔盒里有三支铅笔。i like to write words by using pencils.我喜欢用铅笔写字。i bought 10 pencils for her children.