皿を洗うのを

washing the dishes

→ 皿
phrase Rare #35,450
washing the dishes The の nominalizes 皿を洗う (to wash the dishes), allowing the whole phrase to act as the object of verbs such as 手伝う (to help).
JA: 皿を洗うのを手伝ってくれませんか。
EN: Would you help me wash the dishes?

皿を洗うのを手伝ってくれませんか

Would you help me wash the dishes?

私は母が夕食後皿を洗うのを手伝おう

I will help my mother wash the dishes after dinner.

私は彼女が皿を洗うのを手伝った

I helped her wash the dishes.

皿を洗うのを手伝いましょう

Let's help wash the dishes.

私は母が皿を洗うのを手伝った

I helped my mother wash the dishes.