（a）As it is, things are getting better and better.
(b) Leave it as it is.
这两个句子中的 as it is 的意义和用法是相同的吗？
用在句首的 as it is(was) 与用在句末的 as it is(was)，无论在语义或用法上都是不同的。用在句首的 as it is(was) 的前面一般要有一个与事实相反的情节，而用 as it is(was) 来陈述真实的情况，通常译为“事实上”“实际上”“实际情况是”。
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I thought conditions would get better, but as it is they are getting worse. 我以为情况会好转，但事实上反而更糟了。
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If he were not ill, he would go to see the play. As it is, he has to stay at home. 如果他不生病的话，他是要去看戏的。实际上，他只好呆在家里了。
用于句末的 as it is(按原来的样子, 照现在的样子), 常常放在名词或代词的后面, it 便是替代前面的单数名词或代词的, 如前面的名词为复数名词, 则应将 it 变为 they, 而将 is 变为 are (as they are), 如前面的代词为 I (me), 则这个结构为 as I am。
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Leave it as it is. 别动它,请保持原来的样子。
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I like the house better as it is. 我更喜欢这所房子现在这个样子。
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Paint me as I am. 把我如实地画出来。
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State the facts as they are. 实事求是地把事实摆出来。