Jhon asked me if I knew where he was (direct) 

= Jhon said to me. "Do you know where he is?"

Karim liked the late spring (Make it interrogative) 

= Didn't Karim like the late spring.

Respect the elders. (Passive) 

= The elders should be respected.

Robindranath Tagore was not only an outstanding poet and he was a very committed educator = Rabindranath Tagore was not only an outstanding poet but also a very committed educator.

Rony Said, I walk a mile everyday' (indirect) 

= Rony said that he walked a mile everyday.

Someone will walk her dog. (Passive) 

= Her dog will be walked.

Take care of your health. 

= Let your health be taken care of.

The army is a collection of soldier. 

= The army is a collection of soldiers.

The book is written by him. (Active) 

= He writes the book.

The chair is made from wood. 

= The chair is made of wood.

The reported speech for the sentence "She said to me, 'Did you fake the examination?'" can be changed to:

She asked me if I had faked the examination.

The teacher said, 'Do it' (indirect) 

= The teacher ordered to do it. 

They said that they had watched the movie already (direct) 

= They said, "We have already watched the movie."

Twenty years ago, I was leaving in Paris (Make it compound).

= It was twenty years ago and I was living in Paris.

When he was four, he left his village (Make it complex). 

= At the age of four, he left his village.