insane

English as a Second Language English Vocabulary, Grammar and Idioms
1

a.

  1. Doctors certified him insane.
  2. Doctors certified him as insane.
  3. Doctors certified him an insane man.
  4. Doctors certified him as an insane man.
  5. Doctors certified him to be an insane man.
    b.
  6. John was seen dishonest.
  7. John was seen to be dishonest.
  8. John was seen as dishonest.
    Are these sentences fine?
2

All of ‘a’ are feasible in some way or another.

b1 is not correct.

3

Beeesneees,
Can I write: “Doctors certified him to be as an insane man.”?
Is it right or wrong?
Thanks.

4

No, that is not correct.