These building plans...(design) by a famous architect His homework....(never/hand) in on the time

`1.` are designed

`-` by a famous architect `->` câu bị động HTĐ.

`-` S + am/is/are + Ved/Vp2 + ( by + O )

`-` These building plans số nhiều `->` are 

`2.` has never handed

`-` Thì HTHT dấu hiệu never.

`(+)` S + have/ has + Ved/Vp2

`(-)` S + haven’t/ hasn’t + Ved/Vp2

`(?)` Have/ Has + S + Ved/Vp2 ?

`1)`  is designed

`@` Cấu trúc câu bị động: S + to be + $V_{P2}$  + by + O 

`2)` had never handed

`@` Cấu trúc hiện tại  hoàn thành: S + had/have + $V_{P2}$ + O