shiroi kami o ichimai nooto ni hasande okimasu.

I will put one sheet of white paper into my notebook in advance.

Breakdown of shiroi kami o ichimai nooto ni hasande okimasu.

• を: direct object particle
• に: location particle
• 白しろい: white
• 〜て おく: to do something in advance

Questions & Answers about shiroi kami o ichimai nooto ni hasande okimasu.

Why is it 白い紙 and not 白の紙 or 白な紙?

白い is an i-adjective, so it can directly modify a noun:

• 白い紙 = white paper

You do not need の or な here.

• 白の紙 can exist in some contexts, but it sounds more like paper of the color white and is less basic/plain than 白い紙
• 白な紙 is incorrect, because 白 is not a na-adjective in this use

So 白い紙 is the normal way to say white paper.

What does 一枚 mean here?

一枚 is a counter meaning one flat item.

Japanese often uses special counters depending on the shape/type of the object. 枚 is used for thin, flat things such as:

• paper
• shirts
• plates
• tickets

So:

• 紙を一枚 = one sheet of paper

Here, 一枚 tells you that the speaker means one sheet.

Why is the particle を attached to 紙, not placed after 一枚?