`1,` Students' phones must be turned off in class.

`-` Câu bị động của đtkt: S `+` đtkt(must/can/..) `+` be `+` V3/V-ed…(by `+` O) 

`2,` The software has been updated since last July.

`-` Câu bị động HTHT: S `+` have/has `+` been `+` V3/V-ed..(by `+` O) 

`3,` A new account was set up.

`-` Câu bị động qkđ: S `+` was/were `+` V-ed/V3…(by `+` O) 

`4,` Some of these files are being deleted.

`-` Câu bị động HTTD: S `+` am/is/are `+` being `+` V3/V-ed… (by `+` O) 

`5,` The test results were posted to you last Wednesday.

`-` Câu bị động qkđ: S `+` was/were `+` V-ed/V3…(by `+` O) 

`6,` The language app has been downloaded over `250,000` times.

`-` Câu bị động HTHT: S `+` have/has `+` been `+` V3/V-ed..(by `+` O) 

`7,` The course was done online 2 weeks ago.

`-` Câu bị động qkđ: S `+` was/were `+` V-ed/V3…(by `+` O) 

#td.

`1.` Students' phones must be turned off in class.

`-` Bị động modal verbs : S + must + be + V-ed/c3 + ... + ( by + O )

`2.` The software has been updated since last July.

`-` Bị động HTHT : S + have / has + been + Vpp + ... + ( by + O )

`4.` A new account is set up.

`-` Bị động HTD : S + am / is / are + Vpp + ... + ( by + O )

`5.` Some of these files are being deleted.

`-` Bị động HTTD : S + am / is / are + being + Vpp + ... + ( by + O )

`6.` The test results were posted to you last Wednesday.

`-` Bị động 2 tân ngữ : S + be + Vpp + O2 + ( by + O )

`7.` The language app has been downloaded over 250000 times.

`8.` The course was done online two weeks ago.