Giải hộ với gấp ak nhanh giúp

`1`. I haven't talked to him for 2 months.

`-` Chủ ngữ I phải dùng have nhé!

The last time, S+ V2/ed ... +was/when +time +ago

 S +have/has +not +V3/ed +... +since/for

`2`.I haven't met my aunt for nearly 3 weeks 

`3`.If you don't pay attention, you will fail to understand the lesson.

`-`If not=Unless

`4`.Unless he keeps silent, he will be punished by the teacher.

`-`Unless + S + V (s/es), S + will/shall/can + Vinf

`5`.This building is the most expensive in this area.

So sánh hơn nhất:S + V + the + adj/adv(ngắn) + est + N.

                              S + V + the + most+ adj/adv(dài)  + N.

`6`.Math isn't as interesting as than English

`-`So sánh bằng (phủ định):S + V+ not as/so + adj/adv + as + N/pronoun