〜を前に(して)
ahead of, facing, with … looming
Noun + を前に(して) / を控えて
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を前に means an event or presence is right in front of you, in time or in space: 試験を前に、緊張している, "I'm nervous with the exam coming up".
In time, it's an important upcoming event: exams, graduation, a final, an election. In space, it's something impressive in front of you: a big audience, a beautiful view, a mountain of work.
It's more vivid and formal than の前に (N5), which is just a plain "before". を前に implies facing the thing and feeling something about it: nerves, awe, resolve. を控えて is close in the time sense and means "with … coming up".
Examples
試験を前に、緊張している。
I'm nervous with the exam coming up.
大勢の観客を前にして、足が震えた。
Facing a huge audience, my legs shook.
卒業を前に、先生にお礼の手紙を書いた。
With graduation approaching, I wrote my teacher a thank-you letter.
決勝戦を前に、選手たちは気合十分だ。
With the final coming up, the players are fired up.
美しい景色を前にして、言葉を失った。
Faced with the beautiful view, I was lost for words.