Question

PLAY A BASEBALL MATCH的主语是什么？HAVE A BASKETBALL GAME的主语呢？能否说THERE IS HAVING A FOOTBALL

GAME 或THERE IS GOING TO HAVE A SOCCER MATCH

Answer 1

PLAY A BASEBALL MATCH和HAVE A BASKETBALL GAME是短语，不具有完整的句型结构，自然也没有主语，THERE IS HAVING A FOOTBALL GAME和THERE IS GOING TO HAVE A SOCCER MATCH是错误的，第一句中there be是独立的句型，不应在后面接现在分词，第二句中There be句型和be going to是两个句型，be going to只表示将来时，与句子的其他句型无关，应为THERE IS GOING TO BE A SOCCER MATCH

追问

HAVE A BASKETBALL GAME的主语呢？PLAY A BASEBALL MATCH的主语是什么？

追答

这两个是短语不是句子，所以没有主语

追问

PLAY A BASEBALL MATCH如果要加主语应是什么？HAVE A BASKETBALL GAME的主语呢？

追答

任意名词，代词或名词性短语

追问

那能否说STH PLAY A BASEBALL MATCH或STH HAS A BASEBALL GAM？STH能作他们的主语么？SB呢？

追答

语法上没有问题，逻辑上就要视情况而定了

Answer 2

可以理解为you。因为是对对方说的，所以省略主语“你”。
中文也也一样，一般不说：你去学校。而会说：去学校。

there be 句式表达的是某处存在某物。所有有一场足球赛直接There is a football game.就可以了。或者用将来时态：There is going to be a football match.

追问

PLAY A BASEBALL MATCH如果要加主语应是什么？HAVE A BASKETBALL GAME的主语呢？

追答

You，go and play a baseball match. You，go and have a basketball game.
但是现实中是一般是不这么说的。

追问

追问那能否说STH PLAY A BASEBALL MATCH或STH HAS A BASEBALL GAM？STH能作他们的主语么？SB呢？

Answer 3

祈使句 没有主语 更不如说是短句 词组