that从句能位于介词之后吗?怎么有的说能有的说不能呢?有特殊情况吗?请举例说明 ,I know nothing about my new neighbor except that he used to work with a company.这里的介词except后不就加that了吗?

介词except和in之后可以接宾语从句,其它不可以,如果有形式宾语可以如 Whether we can finish the work depends on it that everyone works hard.
You must see to it that you turn off the lights before you lock the door..