Answer:
1. construct sentences thing
a. I regret to inform you that we cannot publish your work at this time.
b. He got in trouble because of his absurd behavior.
c. How much does this book cost?
2.
a. Why was it so difficult to forgive him, if it meant nothing to you?
b. What time does the plane leave for Paris?
3.
a. The teacher rode to school every day.
b. I used to go to bed at ten o' clock.
c. There were only three pens in the box.
d. The milk was in the jug.
e. The soldiers were riding horses.