Động từ thường:
1. Why do you always go to school late?
2. Why does Jimmy like living in the city?
3. Why did you laugh at your classmates?
Công thức: Why + trợ động từ + S + V ...?
Động từ tobe:
1. Why is it so old today?
2. Why are they taller than me?
4. Why was your mom angry with you yesterday?
Công thức: Why + tobe + S + adj + ... ?
Động từ khuyết thiếu:
1. Why should we wash our hand carefully before having meals?
2. Why can she speak English so fluently?
3. Why can't I drink milk in the evening?
Công thức: Why + modals + S + V (nguyên thể)...?
