怎样把there're lots of buses改为单数句

There is a bus.

there're lots of buses这里there表指代。
把后面每个词变成单数就好了。

A lot of buses is there.

There is a bus.

这是典型的there be结构，如果要改为单数，就要把原来是复数的are改为is.
lots of 表许多，既然是单数，就要改为a,而buses也要去掉es表单数。
改后的整个句子应是:There is a bus./There's a bus.

there is a bus.