1.Quynh / Lan / not usually go / school / late
⇒Quynh Lan usually doesn't go to school late.

Công thức: S+ usually + don't/doesn't + go + to school + late.

vì chủ ngữ số ít nên dùng doesn't
2.I / hot / finish / letter / yet
⇒I haven’t finished the letter yet, and it’s hot.

Công thức: S + haven't/hasn't + finished + O + yet .

vì chủ ngữ là "i" nên dùng haven’t 

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