It’s 18 past 4 (Official clock system).

16:18

It’s 18 past 4.

Correct answer

16:19

It’s 19 past 4.

Error: 1 minute later

16:06

It’s 6 past 4.

Error: read minutes starting from hour markings and adding minutes

16:20

It’s 20 past 4.

Error: confuse hour and minute hands