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Would anybody please tell me the exact usage of this.
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Hi,
Anonymous Would anybody please tell me the exact usage of this?
is to be done = is supposed to be done.

has to be done = must be done.

Compare:

is about to be done = is going to be done.

Regards
Comments  
You can tell "What is to be done next?"

"is to be done" generally means that something will be done in the near future. Hope someone could help you better.
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"is to be done / has to be done"

Examples :
  1. My car is to be cleaned on monday = my car is going to be cleaned (certainty)
  2. My car has to be cleaned on monday = there's an obligation that someone must cleaned the car on monday.
  3. "there's something to be done,we won't have to buy another car",this means that there's a way of putting it right.
everlastinghopeMy car has to be cleaned on monday = there's an obligation that someone must cleaned the car on monday.
 Regards's reply was promoted to an answer.
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This room is to be cleaned ----------------The Planning not done properly.

This room has to be done------------------The Planning is done properly.