The particle ば is used for: Provisional Conditional (If) (JLPT N4). The conditional verb ending 'ば' (ba) marks the preceding clause as a prerequisite condition: 'provided X is true, Y follows'.
Context Example
安けれ[ば]買います。
Yasukereba kaimasu.
If it is cheap, I will buy it. (Role: Provisional Conditional)
Which particle matches the function "Provisional Conditional (If)" (e.g. inside "安けれ[ ]買います。")?
Correct! 🎉
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