三、as作为从属连词引导原因状语从句

as 引导的原因状语从句常放在主句前，表示“因为，由于”。如：

As she is a model teacher, she gives a good example to others. 因为她是一名模范教师，她给其他人树立了一个好的典范。

As he wasn’t ready in time, we went to the cinema without him. 由于他没有及时准备好，我们就去看电影了，没有等他。

四、as作为从属连词，引导让步状语从句

as引导让步状语从句比较特别，它要求将主语和谓语或谓语的一部分倒装。如：

Old as he is, he is still full of energy. 尽管年纪大了，但他依然精力充沛。

Try as she may, she never succeeds. 尽管她很努力，但总是不成功。

Much as I admire Mr. Wang as a poet, I don’t like him as a man. 尽管我喜欢王先生的诗歌，但我不喜欢他的为人。

注：当倒装后置于句首的名词为单数可数名词时，习惯上不带冠词。如：

Boy as he was, he was made king. 尽管他还是个孩子，却被立为国王了。