1) The three of these exercises have to be done by you by tomorrow.  

2)The book you need can be found in any library.

3)These letters have to be sent at once.

4)The box must be taken to the station.

5) The river can be crossed on  a raft.

6)The building of the house can be finnished very soon.

7)The Books must be returned the day after tomorrow.

8)This mistake can be easily forgiven.

9)Such barries can be found everywhere.

10) This work has to be done very carefully.

11)The doctor says she has to be taken to the hospital.

12) The work can be done in three days.

13) All the library books must be returned by students before each summer vacation.

14) Even the tallest trees can be climbed by monkeys.