We should remember that industry is the key to success. (Passive) (Change the sentence)

Who does not want to succeed in life? (Assertive) = Everybody/Everyone wants to succeed in life. 

Being industrious, everyone can prosper in life. (Negative) = Without being industrious, none can prosper in life 

It is not an easy thing. (Affirmative) = It is a difficult thing. 

The idle always lag behind. (Complex) = Those who are idle always lag behind. 

We must work hard so that we can earn money. (Simple) = We must work hard to earn money. 

By working hard, we can improve our lot. (Compound) = We work hard and in this way we can improve our lot.