I know the boy. (Passive) = The boy is known to me.

I know where he was born. (Simple) = I know his birth place

I live in Bangladesh.

I lost this pen yesterday. (Complex) = This is the pen which I lost yesterday.

I prefer milk than tea. = I prefer milk to tea.

I returned back form Dhaka. 

= I returned from Dhaka.

I said to my teacher, 'Good morning, sir'. (indirect) 

= I respectfully wished my teacher good morning.

I saw him go. 

= He was seen to go by me.

I saw his pulse. = I felt his pulse.

I saw a one eyed man.

I shall comply with your request.

I shall inquire into the matter.

I sided with him.

I want a car to drive. (Complex) = I want a car that I can drive.

I was annoyed but still kept quiet .