My sister gave my 4 year old an English grammar book and the first page was about assessing the child's vocabulary. One entry was to enumerate the days of the week in order.
Me: Tell me the days of the week in order.
G: Xingqi 1, Xingqi 2, Xingqi 3, Xingqi 4, Xingqi 5, Xingqi 6, Xingqi Ri
(Translation: Day 1, Day 2, Day 3, Day 4, Day 5, Day 6, Day sun)
Me: Good. English channel please.
G: Uhh... Monday. Twosday. Wednesday. Foursday. Fiveday. Sixday. Sunday!
I like this book. Ironically, the English books of my 4 year old in a local school in China seems more advanced.