Father earns money for us all change into passive voice.

To change into passive voice you must make the object that is receiving the action (In this case that is "money" since the "money" is "earned") the subject instead.  

Another think to keep in mind:

When a sentence is passive it's because the action is being indirectly done. In this case, once the sentence becomes passive, it will seem like the "money" is doing to "earning", but we know that it is actually the "father"  

The money was earned by Father for all of us

Hope this helped!

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d. cassius cannot believe that a weakling like caesar has become so great.

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