`A`.

`1`.I am invited to his birthday party by John

`\rightarrow` Câu bị động - Thì HTĐ : S + be + V3 / PII ( by O )

`2`.Fansipan is the highest mountain in Viet Nam

`\rightarrow` So sánh nhất : S + be + the adj-est / the most adj

`3`.There isn't any beef in the market

`\rightarrow` Thì HTĐ ( CPĐ - ĐT Tobe ) : S + be not+ adj / n

`4`.How much does a bow of noodles cost ?

`\rightarrow` Cấu trúc : How much + do / does + S + cost ?

`B`.

`1`.Water puppetry is always performed in a pool

`\rightarrow` Câu bị động - Thì HTĐ : S + be + V3 / PII ( by O )

`2`.Life in Ha Noi is different from life in Ho Chi Minh City

`\rightarrow` Cấu trúc : S1 + be / be not + different from + S2

`3`.Have you ever tried eel soup in Nghe An ?

`\rightarrow` Thì HTHT ( CNV ) : Have / Has + S + V3 / PII ?

`\rightarrow` Đặc điểm nhận dạng : ever

`4`.My new very interesting hobby is carving eggshells

`\rightarrow` Thì HTĐ ( ĐT Tobe ) : S + be + adj / n

`\text{@ Fox}`