1. look for - search/seek - ex : He is looking for his keys.
2. look up to - search/seek - ex : His father is his model. He is the person he looks up to.
3. look forward to - await eagerly/anticipate with pleasure - ex : She is looking forward to visiting Paris.
4. look up - to try to find a piece of information by looking in a book or on a computer - ex : She didn't understand the word. So she looked it up in her dictionary