N1 Grammar ①　をもって

をもって / をもとに — formal conclusion & creative basis

'As of today, we close.' 'This film was made based on a true story.' — をもって announces a formal end point; をもとに names the creative source material.

What you'll learn

• をもって: formal 'with this / as of' — announces a conclusion or decision
• をもとに: 'using ~ as material / based on' — source for creating something
• Fixed phrases: 本日をもって, これをもって, 今回をもって
• をもとに vs に基づいて: creative source vs following rules/evidence

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