Meaning & usage
ただし adds an exception or condition to what was stated immediately before, meaning however or provided that. It stands alone at the start of a new sentence, usually as ただし、 followed by a complete sentence, and it does not attach directly to a verb, noun, or adjective. It sounds formal and appears in rules, notices, and explanations, so a prior statement allowing something must come first.
Example sentences 5
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経験は最良の教師である。ただし授業料が高い。
Experience is the best of schoolmasters, only the school-fees are heavy.
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写真は自由です。ただし、フラッシュは禁止です。
You can take photos. However, flash is prohibited.
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参加できます。ただし、予約がいります。
You can join. However, you need a reservation.
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駐車場は無料です。ただし、夜は閉まります。
Parking is free. However, it closes at night.
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辞書を使えます。ただし、携帯はだめです。
You can use a dictionary. However, cell phones are not allowed.
In past JLPT papers
This came up in 1 past exam question.