It’s 20 past 6 (Official clock system).

06:20

It’s 20 past 6.

Correct answer

05:40

It’s 20 to 6.

Error: mirror minute hand about the vertical axis

06:04

It’s 4 past 6.

Error: read minutes as hours with ‘past’ or ‘to’

04:30

It’s half past 4.

Error: confuse hour and minute hands