9. A large amount of money was suggested investing in the property market.

Giải thích: S + V(qkđ) + O + .... => O + was/were + VpII + ...

10. Don't let you white clothes be washed with other clothes in different colours.

Giải thích: Don't + V + O(vật) + ... => Don't + let + O(vật) + be + VpII + ...

11. The mechanic should be got to check your car once a month.

Giải thích: S + should + Vo + O + ... => O + should be + VpII + ...

`1.` Investing a large amout of money was suggested in the property market.

`-` QKĐ : S + was/were + P2 by O

`2.` Your white clothes shouldn't be washed with other clothes in different colours.

`-` S + shouldn't be P2 by O : không nên được làm gì

`3.` The mechanic should be got to check your car once a month.

`-` S + should be P2 by O : nên được làm gì