It’s 19 to 8 (Official clock system).

19:41

It’s 19 to 8.

Correct answer

19:40

It’s 20 to 8.

Error: 1 minute earlier

18:51

It’s 9 to 7.

Error: read minutes starting from hour markings and adding minutes

20:35

It’s 25 to 9.

Error: confuse hour and minute hands