It’s 10 to 4 (Official clock system).

03:50

It’s 10 to 4.

Correct answer

04:10

It’s 10 past 4.

Error: mirror minute hand about the vertical axis

10:03

It’s 3 past 10.

Error: confuse hour and minute hands and read as hours with ‘past’ or ‘to’

10:15

It’s a quarter past 10.

Error: confuse hour and minute hands