I cannot make out these four boy.

I don't care what he says about me.

I differ with you on this point.

I get up in the morning at 6 AM.

I got the work done by him.

I have a headache.

I have killed the bird. 

= The bird has been killed by me.

I have no prejudice against her

I know that he is honest.   = I know him to be honest.

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.