yoyakubangou o wasurenai you ni, techou ni kaite okimasu.

direct object particle

Breakdown of yoyakubangou o wasurenai you ni, techou ni kaite okimasu.

• 書かく: to write
• 忘わすれる: to forget
• 〜ない: negative form

Questions & Answers about yoyakubangou o wasurenai you ni, techou ni kaite okimasu.

What does 忘れないように mean here?

It means so that I don’t forget or in order not to forget.

The pattern is:

• dictionary form + ように
• negative form + ように

So here:

• 忘れない = do not forget / won’t forget
• 忘れないように = so as not to forget

In this sentence, it gives the purpose of the main action:

• 予約番号を忘れないように、手帳に書いておきます。
• I’ll write the reservation number in my planner so that I don’t forget it.

What is ように grammatically? Is よう a separate word?

Yes. よう is a separate word, and in this pattern ように works like so that or in such a way that.

You do not usually translate よう literally here. It is part of a set grammar pattern:

• 忘れないようにする = make sure not to forget
• 見えるようにする = make it so that it can be seen
• 聞こえるように話す = speak so that it can be heard

So in your sentence, 忘れないように is a very natural purpose expression.

Why is ように used instead of ために?