Mọi người giúp em btvn vs ạ

`12)` have changed

`->` S + have/has + V3 + ... + since [thời gian]

`13)` was `-` found

`->` over `400` years ago `=>` QKĐ

`->` S + V-qk + ...

`14)` has never been climbed `-` have tried `-` has ever succeeded `-` died

`->` S + have/has + never + been + V3 ...

`->` S + have/has + (ever) + V3 ...

`->` S + V-qk + ...

`15)` have never visited `-` have travelled `-` went `-` visited `-` spent `-` hiked `-` flew

`->` S + have/has + never + been + V3 ...

`->` S + have/has + (ever) + V3 ...

`->` S + V-qk + ...

`-`

@magnetic

`12` .have changed , saw

`->` since `+` mốc thời gian `->` HTHT

`->` Cấu trúc HTHT : `(?)` wh-word `+` have/has `+` S `+` V3/-ed

`->` the last time `+` S `+` V2/-ed : lần cuối ai làm gì

`13` .was ,found 

`->` ago `->` QKĐ

`->` Cấu trúc QKĐ : `(+)` S `+` V2/-ed

`->` bị động QKĐ : `(+)` S `+` was/were `+` V3/-ed `+` O

`14` .has never been , has tried , has ever succeed , died 

`->` never , ever `->` HTHT 

`->` Cấu trúc HTHT : `(+)` S `+` have/has `+` V3/-ed

`->` Cấu trúc QKĐ : `(+)` S `+` V2/-ed 

`15` .have never visited , have travelled , went ,  visited , spent , have hiked , few 

`->` never `->` HTHT , for `+` khoảng thời gian `->` HTHT , several time `->` HTHT

`->` Cấu trúc HTHT : `(+)` S `+` have/has `+` V3/-ed

`->` the last time `+` S `+` V2/-ed : lần cuối ai làm gì

`->` Cấu trúc QKĐ : `(+)` S `+` V2/-ed