1.I didn't expect you _______(wait) for me here.

1.I didn't expect you to wait for me here.
expect sb to do sth 是固定搭配,在这to wait 是动词不定式作宾补.
2.She was the first woman elected to such a great post.译:她是第一个当选到如此高位的妇女.
此句与动词不定式无关,elected to such a great post是过去分词短语作后置定语,修饰woman.因为woman和elect是被动关系,所以elect 变成过去分词.