Is に optional in this sentence?


In this sentence:

> わたしは、ほぼほぼ計画通りに過ごすことができた一年でした。

Does the に particle make "計画通り" an adverb?




Yes it's optional. The following sentences are both correct and feel exactly
the same to me.

>   * ほぼほぼ計画通りに過ごすことができた一年でした。
>   * ほぼほぼ計画通り過ごすことができた一年でした。
>

に is not necessary in [certain standalone
adverbs](https://japanese.stackexchange.com/a/41536/5010), and it's optional
in some adverbial phrases, too. ～通り is a phrase where に is optional. E.g.,
予定通り(に)通過する, 予告通り(に)放送する, 練習した通り(に)やる.

You should remember when に is optional to answer a question like
[this](https://japanese.stackexchange.com/q/42328/5010).

See also:

  * [Difference between くらい and くらいに](https://japanese.stackexchange.com/q/42280/5010)




Yes it's optional. The following sentences are both correct and feel exactly
the same to me.

>   * ほぼほぼ計画通りに過ごすことができた一年でした。
>   * ほぼほぼ計画通り過ごすことができた一年でした。
>

に is not necessary in [certain standalone
adverbs](https://japanese.stackexchange.com/a/41536/5010), and it's optional
in some adverbial phrases, too. ～通り is a phrase where に is optional. E.g.,
予定通り(に)通過する, 予告通り(に)放送する, 練習した通り(に)やる.

You should remember when に is optional to answer a question like
[this](https://japanese.stackexchange.com/q/42328/5010).

See also:

  * [Difference between くらい and くらいに](https://japanese.stackexchange.com/q/42280/5010)

