I) change the sentences into passive voice

1)They have just completed their presentation

2) Jane has already made a big cake

3) we have written 3 essays sofa

4) the milk man has left 3 bottles of milk

5) Trang has just sung 3 English songs

`1` Their presentation has just been completed 

`2` A big cake has already been made by Jane

`3` 3 essays have been written so far

`3` [ thêm từ tus ] Trees are being planted in the park now

`-` BĐ `-` HTTD : (+) S + am/is/are + being + `V_(pp)` + ... + (by O/sb)

`-` Chủ ngữ "trees" số nhiều `->` Dùng are

`4` 3 bottles of milk have been left by the the milk man

`5` 3 English songs have just been sung by Trang

`____________________________`

`-` Cấu trúc câu bị động thì hiện tại hoàn thành : 

(+) S + has/have + `V_(pp)` + .... + (by O/sb)

(-) S + have/has + not + `V_(pp)` + ... + (by O/sb)

(?) Have/has + S + `V_(pp)` + ... + (by O/sb) `?`

`-` He/she/it chủ ngữ số ít + has

`-` You/we/they chủ ngữ số nhiều + have

`\text{@ TheFallen}`