Change the following sentences as directed in the brackets. (a) Mr. Ant made proper use of his time. (Negative) (b) Mr. Grasshopper used to pass his time in singing only. (Make it negative) (c) He was a very worthless person. (Make it exclamatory) (d) He could not but suffer at last. (Make it affirmative) (e) We should learn a lesson from this story. (Imperative)