Look After: take care of someone or something.
Look Ahead: think about what will happen in the future and make plans.
Look Back: think about something that happened in the past.
Look For: try to find something.
Look Forward To: feel excited about something that is going to happen.
Look Out: be careful.
Look Through: read something quickly and briefly.
Look To: rely on somebody or something.
Look Up: find the information.