下面这些句子应该用形式宾语正确,还是直接把句子放在宾语的位置正确?
形式宾语:
我们发现他们什么时候去那里很重要。
We find it important when they will go there.
我们发现他们怎么去那里很重要。
We find it important how they go there.
我们发现他们为什么去那里很重要。
We found it important why they went there.
直接放在宾语的位置:
We find when they will go there important.
We find how they go there important.
We found why they went there important.
以上句型,哪种句型正确,望老师不吝赐教。