Đáp án:

`1,` Phong and Thang weren't invited to the party.

- Bị động QKĐ $(-)$ S + was / were + not + V3 / PII ( by O ).

- Phong and Thang là chủ ngữ số nhiều `->` Dùng weren't

`2,` The boss asked if / whether I was going to meet his friends at the NoiBai airport the following day / the next day.

- Câu tường thuật NV (Wh-Question) `:` S + asked + if / whether + S + V (lùi thì)

- Lùi thì `:` HTTD `->` QKTD $(+)$ `:` S + was / were + Ving

- Đổi chủ ngữ `:` You `->` I`,`Your `->` His

- Đổi thời gian `:` Tomorrow `->` The following day / the next day

`3,` If Huy were good at English`,`he could get the job.

- CĐK loại `2:` S + V (QKĐ)`,` S + could / would / might + V

`4,` It has rained since two p. m.

- S + started / began + Ving / to V + (at / in ...) + thời gian (cụ thể)

`=` S + has / have + V3 / PII + since + mốc thời gian / for + khoảng thời gian

`5,` She designs more creatively than me.

So sánh hơn - Adv `:` 

- Trạng từ ngắn `:` S + V + adv - er + than + O.

- Trạng từ dài `:` S + V + more + long adv + than + O.

`6,` Although the Pickes doesn't speak Vietnamese`,`he decided to settle in Da Nang.

- In spite of / Despite + N / Ving / N phr`,`+ Mệnh đề

`=` Although + Mệnh đề `1``,`+ Mệnh đề `2`