`Answer:`

`1,` Pizza is made in Italy

`2,` Whom was the letter sent?

`3,` Are cars produced in Germany?

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$\text{*Structure: Passive voice}$

`@` Câu bị động thì HTĐ:

`+)` $\text{S + am/is/are +VpII + by O...}$

`-)`  $\text{S + am/is/are + not + VpII + by O...}$

`?)` $\text{Am/Is/Are + (not) + S + VpII + by O...}$

`@` Wh_question passive voice:

`-` $\text{Who(m) + was/were + S + Vpp + by O...}$

`#TD`

`1.` Pizza is made in Italy

`-` Bị động HTĐ: S + am/is/are + V3/ed + (by + O)

`2.` Whom was the letter sent?

`-` whom : của ai

`-` Bị động QKĐ: S + was/were + V3/ed + (by + O)
`3.` Are cars produced in Germany?

`-` Bị động HTĐ: S + am/is/are + V3/ed + (by + O)