There are many advantages in doing it. 这样做有很多好处。
这句话和上一句比较类似,使用there be句型,doing it可以换成有好处的事物。
There are many advantages in eating fruit: ① help to lose weight, ②delight your mood.
吃水果有很多的好处:①有助于减肥,②可以让你心情愉悦。

It does us a lot of good. 这对我们有很多好处。
这句话里的good是名词,表示“好处、益处”。
Reading does us a lot of good. Books are our good friend.
读书对我们有很多好处。书是我们的好朋友。

It benefits us quite a lot. 这对我们非常有好处。
Benefit也有“优势、好处”的意思。此处的benefit做动词使用。
I don’t like fruits, even if it benefits us quite a lot.
我不喜欢吃水果,即使它对我们非常有好处。

It is of great benefit to us. 这对我们有很多好处。
Getting up early in the morning is of great benefit to us.
清晨早起对我们有很多益处。