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We go for a picnic in the park once in a while．每隔一段时间我们就到公园野餐一次。
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We go out together once in a while but not very often．我们偶尔一道出去，但不常出去。
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It is worth while dealing with this in some detail．比较详细地讨论这一点是值得的。
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whilst有时可用来代替while：
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Whilst she was at some distance, he turned and saw her．当她还离他比较远时，他转身看见了她。
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Whilst in Russia, I was taken ill with appendicitis．在俄国时我患上了盲肠炎。
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Wood is a natural material whilst glass is a manufactured material．木头是自然材料而玻璃是制造出来的材料。
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whilst主要用在书面语中，在口语中不宜使用。
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915 who—whom—who(m)ever
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who可作疑问代词，主要用作主语或表语：
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Who has borrowed my pen？谁借了我的钢笔？
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Who do you think is the best player this year？你认为谁是今年最佳运动员？
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Who are those people？那些人是谁？
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作宾语时，在正式场合用whom（它是who的宾格）：
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Whom do you like best？你最喜欢谁？
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Whom did you meet？你碰见谁了？
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Whom are you writing to？你在给谁写信？
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但在日常口语中多用who代替：
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Who did you meet？你碰见谁了？
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Who did you give it to？你把它给谁了？
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Who did you go with？你和谁一道去的？
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在紧跟介词时只能用whom：
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With whom did you go？你和谁一道去的？
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To whom shall I speak？我应找谁谈？
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