1、look down upon/on
看不起某人，轻视某人
反义词是look up to，两个一起记比较好记，单个词分开来看，look看，down下面，引申出看不起
look down upon/on sb.
2、look up to
尊敬
想到look down upon/on，up上，看得起某人，也就是尊敬的
look up to sb.
3、look up
在（词典参考书）中查找、
look up the dictionary
4、look into
调查
look into sth.
look into doing sth.
5、look forward to
期望，盼望
这里的to 是介词，look forward to doing sth.
6、look through
浏览
look through sth.
