He asked if I had left with you, and I said no.

他问我是不是和你一起离开的，我说不是。

《柯林斯英汉双解大词典》

If I had left sooner, I would have caught the train.

如果早点动身，我就赶上火车了。

youdao

If I had left a little earlier, I would have caught the train.

如果我早一点走，我就会赶上火车了。

youdao

If I had taken the letter, I might never have left his apartment alive."

VOA: special.2009.12.26

But would my buying capacity have been any different if I had left my watch at home this day?

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But gold has continued its run, and silver has risen even faster, and it has been a bit sobering to reflect that my portfolio would have done better if I had left well enough alone.

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It was as if I had never left.

NEWYORKER: Wakefield