Final answer:
The sentence 'Il est quatre heure et de quart (4h15)' is grammatically incorrect. The correct way to say 'It is quarter past four (4:15)' in French is 'Il est quatre heures et quart'.
Step-by-step explanation:
The sentence 'Il est quatre heure et de quart (4h15)' is grammatically incorrect. In French, the correct way to say 'It is quarter past four (4:15)' is 'Il est quatre heures et quart'.
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