有错,把第二个are去掉,译为:有许多男孩在打篮球.
there be 句型表示一种存在,常译为“有”,如:
There are some books on the desk.
There is a picture on the wall.
另外,要遵循就近原则
eg.There is a boy and two girls in the classroom.
There are two girls and a boy in the classroom.
There will be/ There is going to be表示将有.