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which 引导的定语从句只能位于主句后，但as引导的从句可位于主句前、中、后。 例1：Daniel, as you know, is always late for school. 你知道的，丹尼尔上学总是迟到。（as在从句中作动词know的宾语，此处as不能换成which） 例2：Nanjing is a modern city, as/ which we know. 正如我们所知，南京是一座现代化的城市。（as在从句中作动词know的宾语，此处as可以换成which） as在定语从句中作主语时，从句谓语通常要有be或别的系动词，但which不受此限制。 例：The six-year-old girl can cook meals, which surprises all of us. 这个六岁的小女孩会烧饭，这让我们所有人都很惊讶。（which在从句中作主语，此处which不能换成as） as 引导的非限制性定语从句只表示一个众所周知或意料之中的事，常指代整个主句，对主句内容进行评价或加以说明，翻译为“正如”，但 which 不受此限制。 例：He married a girl whose father is a mayor, which was unexpected. 他娶了一个父亲是市长的女孩，这真是出乎意料。（which在从句中作主语，此处which不能换成as） as多用于固定搭配中：as is often the case(这是常有的事)，as was expected(不出所料)，as everyone can see (正如人人看到的那样)，as is known to all(众所周知)，as has been said before(如上所述)，as is mentioned above(正如上面所提到的)等。 例1：As is known to everyone, the moon travels around the earth once every month. 众所周知，月亮每个月环绕地球运转一次。（as在从句中作主语，此处as不能换成which） 例2：As has been said before, we must solve the problem as soon as possible. 正如之前所说，我们必须尽快解决问题。（as在从句中作主语，此处as不能换成which） |
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