1.Not only … but also 连接两个分句,并且 not only 位于句首时,第一个分句中的主语和谓语要部分倒装.例如：
　　Not only does the sun give us light but also it gives us heat.
　　Not only did he speak English correctly,but also he speaks it fluently.
　　Not only is this young man clever but also he is hardworking.
2.not only … but also 中的 not only 不能分开使用,但 but also 却可以分开使用.例如：　　The area was not only hit by an unexpected heavy rain,but some bridges were also washed away.所以以上你给出的两个例子都是对的.
3.not only … but also 连接两个并列成分时,可以省略 but 或 also ,也可以把 but also 都省略掉.例如：
　　I not only heard it but （ also ） saw it.
　　He was not only compelled to stay at home,（ but ） also forbidden to see his friend.
　　She not only finished the task ahead of time,（ but also ） she came to help us.
有更多的问题可加我,很乐意帮你解答.