We need to have actual knowledge on which to base our thinking.
第一个句子为何定语从句只有不定式没谓语动词？
we need to have actual knowledge which to base on our thinking.
第二个句子也是，为何都是to开头的？
We need to have actual knowledge on which to base our thinking.
网友了解这个词组吗？
base A on B：把 A 打造在 B 的基础上
1. 大家造句，用 what 提问 B：
What do you base A on?
2. 把这个直接疑问句变成间接疑问句：
I dont know what you base A on?
3. 大家用定语从句造句：“大家需要有实质的常识来作为大家考虑的基础。”
We need to have actual knowledge which we base our thinking on.
4. 把 on 提到 which 之前：
We need to have actual knowledge on which we base our thinking.
5. 大家用不定式简化这个定语从句：
We need to have actual knowledge on which to base our thinking.
6. 即可得到网友的这个句子！
