sought

leaped

Where was he seen by you? = Where did you see him?

Where they did they go yesterday. 

Where they did they go yesterday.

Where there is smoke, there is fire - There is no smoke without fire

Where have you come from ?

When you think about the job.

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

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

When he began to drink water, a wave swept him away. He was about to drown."

What a nice fellow he is!

A computer is an artificially intelligent machine that is programmed to work under fixed condition; But the human brain is naturally intelligent and it is able to operate on ever changing conditions.

The word knowledge is an abstract noun

"River" is a common noun

Bacon wrote in his essay “Of Studies” that spend too much of time in studies is laziness or inactivity (sloth). Its mean that only study could not be fruitful without experience.