play tennis
tennis 指这项运动时不可数，play 后直接跟 tennis，前面不加冠词。
My sister plays tennis twice a week.
我妹妹每周打两次网球。
网球
tennises — plural of tennis
一种由两名球员(或双打中的四名)交替用球拍击球过网的运动；由两名或四名球员使用球拍隔网来回击球的球类运动
a sport played by two or four players who hit a ball back and forth over a net using rackets
一种由两名球员(或双打中的四名)交替用球拍击球过网的运动
A sport played by two players (or four in doubles), who alternately strike the ball over a net using racquets.
由两名或四名球员使用球拍隔网来回击球的球类运动
a game played with rackets by two or four players who hit a ball back and forth over a net that divides the court
I play tennis with my friends every Saturday morning.
我每周六早上都和朋友们打网球。
用法提示：tennis 为不可数名词，表示网球运动，作 play 的宾语。
She bought a new tennis racket before the summer tournament.
她在夏季锦标赛前买了一个新网球拍。
用法提示：tennis 作名词定语修饰 racket，表示网球拍。
Watching tennis on television is popular in our family.
在我们家，看电视上的网球比赛很受欢迎。
用法提示：tennis 作 watching 的宾语，泛指网球运动或比赛。
tennis 指这项运动时不可数，play 后直接跟 tennis，前面不加冠词。
My sister plays tennis twice a week.
我妹妹每周打两次网球。
要表示“一场”网球比赛时，用 a game of tennis 这样的量词结构，而不是 a tennis。
We had a game of tennis after lunch.
午饭后我们打了一场网球。
tennis 作定语修饰名词时用单数形式，如 tennis court、tennis ball、tennis player。
There are two tennis courts behind the school.
学校后面有两个网球场。
谈论打网球的水平时用 be good/bad at tennis，at 后面不加冠词。
She is very good at tennis.
她网球打得很好。
grammar · medium
易错句子I play the tennis every weekend.
正确表达I play tennis every weekend.
表示从事体育运动时，play 后直接跟运动名称，不加冠词。tennis 是不可数的运动名称，不能说 play the tennis；汉语没有冠词，容易误加 the。
grammar · medium
易错句子I played a tennis with my friend yesterday.
正确表达I played tennis with my friend yesterday.
tennis 是不可数名词，不能直接用 a/an 修饰。去掉 a 后语义不变；若要强调“一场”，应说 a game of tennis 或 a tennis match。
grammar · medium
易错句子We played tennis in the court near my house.
正确表达We played tennis on the court near my house.
表示在球场等场地表面进行活动用介词 on；in the court 通常指“在法院大楼里”，不能表达“在网球场上”。
打网球
We play tennis every Saturday morning.
我们每周六早上都打网球。
网球场
The tennis court is booked for two hours.
这个网球场已经预订了两个小时。
网球运动员
She is a professional tennis player.
她是一名职业网球运动员。
网球比赛
The tennis match lasted over three hours.
那场网球比赛持续了三个多小时。
网球
The dog ran off with my tennis ball.
那只狗叼着我的网球跑掉了。
网球拍
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He bought a new tennis racket for the season.
他为这个赛季买了一支新网球拍。