A preposition relates a noun or pronoun to another word in a sentence.

A prepositional phrase begins with a preposition and ends with a noun or pronoun.

Pick the prepositional phrase for each sentence
1. A young boy was frail and small for his age.
Answer:for his age

2. His parents thought working at a sport would make him stronger.
Answer: at a sport

3. The boy and his parents talked about sports he might enjoy,
Answer:about sports

4. The young boy quickly decided on ice skating.
Answer:on ice skating

5. In a short time, everyone knew it was a good decision.
Answer:In a short time

All correct?

All are correct! :-)

Pick the preposition in each sentence. Then draw an arrow from the preposition to the noun that is the object of the preposition.

6. The boy skated very well from the beginning.
Answer:from is P and beginning is noun

7. He skated confidently around the rink.
Answer: around is P and rink is noun

8. After a while, the boy took ice-skating lessons.
Answer: after is P and while is noun

9. Over the years, he became a better and better skater.
Answer: Over is P and years is noun

10. He entered ice-skating competitions against excellent skaters.
Answer: against is P and skaters is noun

11. DUring his childhood, he won many awards and titles.
Answer: During is P and childhood is noun

12. The young boy grew into a strong young man.
Answer: into is P and man is noun

13. Then he began working toward a special goal.
Answer: began is P and working is noun

14. He dreamed of the Olympic games, and he reached his goal.
Answer: of is P and Olympic is noun

15. He represented America proudly at the Olympics and won a gold medal.
Answer: at is P and Olympics is noun

Yay! 14 of the 15 are correct.

13 is wrong.

Is the preposition right and the noun is wrong?

Both are wrong.

Is the preposition then?

Goal is noun?

Goal is the object (noun) of the preposition. But "then" is not a preposition.

http://www.englishclub.com/grammar/prepositions-list.htm

Toward is preposition and Goal is noun? :)

Yay! You've got it! :-)