それなら

そ

れ

な

ら

Common wordJLPTN4Freq.FrequencyTop 5,000

Meanings

1

usually written using kana alone

A conjunction used to accept a preceding statement and introduce a conclusion or suggestion based on it. Common in everyday conversation.

それ

なら

、

私わたし

も

行い

き

ます

。

If that's the case, I'll go too.

それなら、早はやく始はじめましょう。

If so, let's start early.

だったらN3
だったら is a casual, colloquial way to say 'if that's the case,' while それなら is the neutral everyday equivalent.
ならN1
ならば is a more formal, literary way to express 'if so,' whereas それなら is the standard conversational choice.
それではN4
それでは often signals a transition to a new action or topic ('well then'), while それなら specifically draws a conclusion from what was just said.
じゃあN5
それなら explicitly means 'if that's the case', while じゃあ is a looser, more casual filler that can also mark a new topic or closing remark.

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さらば
それなら is the common modern way to say 'if so; in that case', whereas さらば in this sense is a dated, formal conjunction found mainly in old literature.
するとN4
それなら is a casual, conversational way to say 'if that's the case', while すると in this sense is a bit more formal and often used to draw a logical conclusion.
そしたら
それなら works in both casual and polite speech to mean 'if so', whereas そしたら is strictly colloquial and often just links events in sequence.
すれば

Compound of それ (that) and なら (conditional form of だ). The kanji 其れ is a historical spelling for それ, but the word is now standardly written in kana.

それなら is the conversational, direct way to say 'in that case' in response to what someone just said, while すれば is more formal or written in feel.

それなら emphasizes a conditional conclusion ('if that's so') more explicitly than それじゃ, which is softer and more conversational.

それなら means 'if that's the case' and is used to draw a conclusion from a stated condition, whereas そうしたら can also simply mark a sequence of events.