It’s 18 to 6 (Official clock system).

05:42

It’s 18 to 6.

Correct answer

05:41

It’s 19 to 6.

Error: 1 minute earlier

04:50

It’s 10 to 5.

Error: read minutes starting from hour markings and adding minutes

08:25

It’s 25 past 8.

Error: confuse hour and minute hands