前一的用法和樣例：
例句
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乘客至遲應在班機起飛前一小時(shí)辦理登機手續。
Passengers should check in one hour before their flight time at the latest.
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你以前一定見(jiàn)過(guò)他。
You must have seen him before.
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雖然我非常希望增加體重，但我仍然像以前一樣的瘦。
Much as I hope I may gain weight, (yet) I am still as thin as before.
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圣誕節前一周，孩子們到各家各戶(hù)去唱圣誕頌歌。
The children went carolling during the week before Christmas.
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來(lái)訪(fǎng)者在中午前一會(huì )兒離開(kāi)了。
The visitor left a little before noon.
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老人前一天晚上停止了呼吸。
The old man ceased breathing the night before.
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