I think that behavior is really bad.

He started to act immediately.

I couldn't understand his actions.

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

He seems to be very tired.

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

I'm tired and can't move my arms and legs as I want.

It is not thought that he can solve the problem.

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

This plan brought about an unfavourable result.