My parents have been to New Zealand for three years.改错

My parents have been in New Zealand for three years.
to 改成in
has been in 是指在.待了多长时间,has been to 是去了某地,不可能要去某地要用3年的时间.
第二题 Her parents has worked for nearly 9 years.或者改成Her uncle started to work 9 years ago.
start是非延续性动词,不能和一段时间状语连用.
再问： 还有一道呢？谢谢。
再答： 嗯，是的，我第一次回答完看到你补充了，所以又修改答案了。