Everyone thinks that the educational system should be reformed.

It was thought that educational system should be reformed

It will be thought that educational system should be reformed

It can thought that educational system should be reformed

It is thought that educational system should be reformed

All of the above

Active Voice = Subject + believe/find/claim/consider/know/report/say/think/ + that + clause.

Passive Voice = It + be + third form of a verb + clause.