-Look up to : admire.
*I have always looked up to my grandfather
-Look for :search
*I am looking for a job nowadays.
-Look down on : despire ,scorn
*Looking down on disabled people is the most horrible thing in the world.
-Look at: stare at sb.
*I am looking at you right now.
-Look after: take care
*I am looking after my little sister tonight.
-Look forward to :wait for
*I am looking forward to going on a holiday.
-Look back on : recollect,remember.
*When I look back on my past years,I always become happy.