So sánh ngang bằng – Công thức: as + adj + as – Ví dụ: Lan is 16. I’m 16, too. Lan is as young as I.(Lan trẻ như tôi) 2. So sánh kém – Công thức: not so/ not as + adj + as – Ví dụ: Quang is metres tall. Hung is metres tall. Hung is not so tall as Quang. (Hung không cao bằng Quang)