1. Oil painting is different from pencil painting (Tranh sơn dầu khác với tranh vẽ bằng bút chì)

=> not the same as = different from

2. Today's exam is shorter than yesterday's exam. (Đề thi hôm nay ngắn hơn đề thi hôm qua.)

3. Your idea is not as same as mine. (Ý tưởng của bạn không giống với ý tưởng của tôi)

=> not the same as = different from

`1` Oil painting is different from pencil painting

`->` not the same as = different from

`->` Cấu trúc : S + to be/linking verb + different from + O

`2` Today's exam is shorter than yesterday's exam

`->` Cấu trúc : S1 + be + adj + er + S2

`3` Your idea is not as same as mine (Giải thích như câu `1`)

`->` Cấu trúc : S + to be + as + adj + as + noun/ pronoun/ clause.