So vs Therefore

When to use each in English, with meaning, register, and examples.

 SoTherefore
Meaningused to say that something is true or to show a resultFor that reason; as a result.
Register-formal
CEFR levelA1B1
Part of speechadverbadverb
Usage notesUsed to connect sentences, showing cause and effect. In informal contexts, it can start statements or express agreement but may be considered vague in formal writing.Use 'therefore' to connect ideas in formal writing or speech. It’s less common in everyday conversation and can sound stiff. Avoid it in casual contexts.

Frequently asked questions: So vs Therefore

What's the difference between "So" and "Therefore"?

"So" means: used to say that something is true or to show a result "Therefore" means: For that reason; as a result.

When should I use "So" and "Therefore"?

"Therefore" is formal.

Are "So" and "Therefore" the same CEFR level?

"So" is at A1, "Therefore" is at B1 on the CEFR scale.

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