`1.` You don't have to tip in Viet Nam.

`\text{→Not have to: S + don't/doesn't + have to + Vinf ...}`

`2.` According to tradition, we decorate to the house at Tet.

`\text{→According to + N, S + V(chia theo thì)}`

`3.` The woodcutter was working in the woods at 7am last Sunday.

`\text{→QKTD: S + was/were + Ving + ...}`

$\textit{→nhận bik: at 7 a.m last Sunday}$

`4.` What a cruel stepmother she is!

`\text{→Câu cảm thán với What kết hợp kể: What (a/an) + adj + N + S + V/be}`

$VII.$ $...$

$1.$ You don't have to tip in Viet Nam.

- S + don't/ doesn't + have to + V (Bare): ai đó không nhất thiết phải làm gì.

$2.$ According to tradition, we decorate the house at Tet.

- According to tradition, S + V: Theo truyền thống ...

$VIII.$ $...$

$3.$ The woodcutter was working in the woods at 7 am last Sunday.

- "at 7 am last Sunday": mốc thời gian rõ ràng trong quá khứ.

$→$ Thì quá khứ tiếp diễn: S + was/ were + V-ing.

$4.$ What a cruel stepmother she is!

- Câu cảm thán: What + a/ an + adj + N (+ S + V) + !