This system is necessary to maintain social fairness.

We believe that we need to reform the education system.

We believe that a reform of the education system is necessary.

I need you.

Your cooperation is needed for this project.

I thought he would be late, but he came on time.

He seems to be very tired.

The reason he is thought of that way is because he always works seriously.

It is not thought that he can solve the problem.

In my opinion, this plan has a high chance of success.