Obligation means things that people need to do. When talking about obligation, the form noun + infinitive is used. Active and passive infinitives are possible to use.
There's a lot of papers to read (to be read).
There are still ten tables to serve (to be served).
List down the items to buy (to be bought).
|However, when talking about the person who will do the action, it's better to use the active infinitive.|
I've got things to finish.
I will lend you a book to read.
Sam gave the accountant the records to review.
|When talking about the action or person/thing that the action is done to, passive infinitive is more appropriate to use.|
The items to be sold are in the box.
The bag is full of coffee beans to be grind.
The clothes to be washed are in the basket.
|Also, it's common to use passive infinitives after "be."|
The car is to be fixed today.
These toys are to be wrapped.
This meat is to be refrigerated.
|2. To Be Seen/Found/Congratulated etc.|
Passive infinitives are used with the expressions anywhere/nowhere to be seen/found. And with verbs expressing value judgments such as congratulate, encourage, avoid, passive infinitive is also applied.
My bag was nowhere to be found.
The car wasn't anywhere to be seen.
His effort is meant to be congratulated.
|3. Nothing To Do and Nothing To Be Done etc.|
Observe the difference between nothing to do and nothing to be done.
I'm bored - there's nothing to do here.
There's nothing to be done - we'll have to get a new one.