1£®The doctor is examining her.

→She is being examined by the doctor.

2£®They are building a new library in our school.

→A new library is being built in our school.  

3£®The students are cleaning the classroom now.

→The classroom is being cleaned now.

4£®They are not starting new nature parks in China.

→New nature parks are not being started in China.

5£®Are they shipping a number of new trucks abroad?

→Are a number of new trucks being shipped abroad?