to start behaving better after doing something wrong
sich nach einem Fehler besser verhalten (sich nach einem fehler besser verhalten)
"After the accident, he decided to turn over a new leaf."
"Nach dem Unfall beschloss er, ein neues Leben zu beginnen." (nach dem unfall beschloss er ein neues leben zu beginnen)
to start a friendship
to be involved in something too difficult to handle
to think or act creatively and unconventionally
to swear that something is true, often said with sincerity
to have ambitious goals and aspirations
to take control or responsibility for something