`1.` Alice has sunburn because she was outside all day yesterday.

`->` Cấu trúc thì HTĐ: S + Vs/es

`+` Thì QKĐ: S + Ved/V2

`2.` Some people say that carving eggshells is difficult.

`->`  Say + "that/wh-" + clause

`3.` She is the most kind-hearted girl I have ever met.

`->` Cấu trúc so sánh nhất(TTD): S + tobe + the + most + adj ....

`+` Thì HTHT: S + have/has + Ved/V3

`4.` Big Heart organization has encouraged people to protect the environment.

`+` Cấu trúc thì HTHT: S + have/has + Ved/V3

`-` Big Heart organization  là chủ ngữ số ít `->` dùng TĐT là has

`5.` Tuan play table tennis with best friends because he finds it can playing

interesing.

`->` Cấu trúc thì HTĐ: S + Vs/es

`6.` They have never visited Ho Chi Minh city before.

`+` Cấu trúc thì HTHT: S + have/has + Ved/V3

`-` They là chủ ngữ số nhiều `->` dùng TĐT là have