It’s 17 to 7 (Official clock system).

06:43

It’s 17 to 7.

Correct answer

06:42

It’s 18 to 7.

Error: 1 minute earlier

05:49

It’s 11 to 6.

Error: read minutes starting from hour markings and adding minutes

09:30

It’s half past 9.

Error: confuse hour and minute hands