On the street,there are many cars.这句话哪里错了?On the street,there are many cars.Do you like to play with a yo-yo?There is a park in the theatre.以上三句中也许有错的有对的,错的告诉我哪里错了,

on 是美国英语，没有错。一般我们说的是：On the street are many cars.
去掉with，直接说play a yo-yo
There is a park near the theatre.
剧场里怎么会有公园啊？
个人看法。
很高兴为你解答！
老师祝你学习进步！
望采纳，多谢你的问题！^_^

第一句语序错了，地点状语在前句子应全倒装。there在这里多余了。
所以有两种改法：
1.on the street are many cars
2.there are many cars on the street
第二句没错。
第三句语义就有问题，
在剧院里有一个公园？
in可以换成别的介词，比如说opposite（对面）

On the street,there are many cars. 没错, on主要用在美国英语 也可用alongDo you like to play with a yo-yo? 把a 去掉, 球类名词前不用冠词There is a park in the theatre. in 改为outside . 公园不可能在戏院...

In the street 在大街上，不用on
第2句把a去掉
There is a park in the theatre改in为near，在剧场里不可能有公园的，应该是附近。