高中英语语法。。as it seems likely中要it和不要it的区别是？

问问题，最好提供完整的句子。

你的这个问题，类似于：

As is known to us all, the earth goes around the sun.

正如我们大家都知道的那样，地球绕着太阳转。

As 引导非限制性定语从句，为关系代词，指代后面整句话的内容。

As it is known to us all, I don't want to repeat it.

由于这个我们大家都知道，我不想再说了。

As 为从属连词，引导原因状语从句。it指前面说起过的那件事情。意为：由于。。。

1.If, as seems likely, the IMF agrees a loan to Hungary, it will follow emergency lending from the European Central Bank.

如果像看似可能的那样，IMF同意向匈牙利提供贷款，它将跟随在欧洲央行的紧急贷款之后。

However, unlike Content-Types and subtypes, the creation of new Content-Transfer-Encoding values is explicitly and strongly discouraged, as it seems likely to hinder interoperability with little potential benefit.

有it的用法例句很少，我很不容易找到一个。专业性很强的句子。