`\color{#145277}{N}\color{#246483}{a}\color{#34768F} {e}\color{#44889B}{u}\color{#539AA7}{n}`

`6.` `A`

`-` DHNB : were

`-` Only one : chỉ có `1` `=>` chia "was"

`@` QKĐ : S + was / were + V3/ed

`7.` `A`

`-` DHNB : since `1980`

`@` HTHT : S + have / has + been + V3/ed

`8.` `C`

`@` HTHT : S + have / has + been + V3/ed

`9.` `C`

`-` DHNB : everyday

`@` HTĐ : S + am / is / are + V3/ed

`10.` `D`

`@` Modal verbs : can, could, may, might, should, ought to, must, have to, will, would, be going to + be + V3/ed

`11.` has been produced

`@` HTHT : S + have / has + been + V3/ed