两句的意思不一样：
There were hundreds of people there.那里有好几百人.
Hundreds of people were there.好几百人在那儿.
应该改成：It has hundreds of people there.it 是代替的哪个词？it代指there那后面的there岂不是多余的吗不多余。没有there，意思又不一样了。It has hundreds of people there. 那里有好几百人。It has hundreds of people. 有好几百人。这种情况下，It可能是学习，公司，等等，无法特指“那儿”