`color{white}{#MPhuc}`

`11.` have never seen `-` was directed

`+` HTHT : `( + )` S + have / has + V`3`/ed

`-` Bị động QKĐ : `( + )` S + was / were + V`3`/ed + by O

`12.` have been trying - to telephone - have...been

`+` HTHTTD : `( + )` S + have / has + been + V-ing

`-` DHNB : all week

`+` try + to V-inf

`+` HTHT : `( ? )` Wh/h + have / has + S + V`3`/ed ?

`13.` blamed

`+` Bị động QKĐ : `( + )` S + was / were + V`3`/ed + ( by O )

`14.` sitting - doing

`+` can't bear = can't stand + V-ing

`15.` ( Because ) he didn't finish

`+` QKĐ : `( + )` S + V`2`/ed