幫我作句!!!thx

service:
Tennis players may not run or walk while delivering a service.
網球手發球時不能走或跑。

topspin:
I currently play tennis for my high school team, but i'm unsuccessful in this position and a lot of the better players I have played hit with amazing amounts of topspin.
我現在為校隊打網球，但我做得不好，而很多比較好的球員跟我對打時擊出數量驚人的上旋球。

backspin:
Backspin stroke is one of the important parts of tennis game and have many different uses in different match situations.
在網球比賽中下旋球球擊是其中一個重要的部分，在不同比賽情況下有不同的應用。
(OR: She hits a heavy backspin stroke.)
(OR: He hits the ball with a backspin style stroke.)

sidespin:
This time the table tennis lesson is about learning how to apply sidespin stroke.
這回乒乓球課是有關學習如何應用側旋擊。

push:
New player should learn push stroke first as it is the most common stroke in table tennis.
新手應先學習推球擊，因在乒乓球裡它是最普通的球擊。

1.) Roger serves the first set as oppose to the opponent.
2.) Roger returns the ball by topspins.
3.)Roger returns the serve by topspins.
4.)Roger returns the serve by sidespins
5.)Roger pushes the ball to the opponent.