The particle に is used for: Frequency / Rate base (JLPT N4). The particle 'に' (ni) is used after a time period to express frequency rate: '[Period] に [Count] 回' (X times per period).
Context Example
一週間[に]二回ジムに行きます。
Isshuukan ni nikai jimu ni ikimasu.
I go to the gym twice a week. (Role: Frequency)
Which particle matches the function "Frequency / Rate base" (e.g. inside "一週間[ ]二回ジムに行きます。")?
Correct! 🎉
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