The recent flood was one of the most devastating floods in our country. (Positive) (Change the sentence)

We have faced a very severe flood recently. (Exclamatory) = What a severe flood we have faced recently! 

Many people of the flood affected area became homeless. (Interrogative) = Didn't many people of the flood affected area become homeless? 

Many conscious people came forward to help the flood victims. (Complex) = Many people who were conscious came forward to help the flood victims. 

The young generation showed very positive attitude in this regard. (Negative) = The young generation didn't show negative attitude in this regard. 

They extended their helping hands to mitigate the sufferings of the flood victims. (Complex) = They extended their helping hands so that they could mitigate the sufferings of the flood victims. 

In fact, they could not but come forward. (Affirmative) = In fact, they had to come forward.