1.These music lessons must be written in ink.

2.Lucycles can be used for short journey in this city.

3.UFOs have been seen several times recently by many people.

4.We aren't allowed to walk on the grass.

5.This software can be downloaded from the Internet.

6.A lot of mountains may be found on Mars.

7.Tuan was sent to a high quality school by his parents last year.

8.A house-warmy party is going to be hold this weekend.

9.A factory is being built to recycle waste paper in this city.

10.Were the mails being checked when the lights went out?

$\text{1.}$ These music lessons must be written in ink.

$\text{→}$ must be + Ved/ P2

$\text{2.}$ Bicycles can be used For Short Journey in this city.

$\text{→}$ can be + Ved/ P2

$\text{3.}$ UFOs have been seen several times recently.

$\text{→}$ have/ has + been + Ved/ P2

$\text{4.}$ We weren't allowed to walk on the grass.

$\text{→}$ was/ were + Ved/ P2

$\text{5.}$ This solfware can be download from the Internet.

$\text{→}$ như câu 2

$\text{6.}$ A lot of mountains may be found on Mars by us.

$\text{→}$ may be + Ved/ P2

$\text{7.}$ Tuan was sent to a high quality school by his parents last year.

$\text{→}$ như câu 4

$\text{8.}$ A house-warming party is going to be held by Jane this weekend.

$\text{→}$ is/ are going to be + Ved/ P2

$\text{9.}$ A factory is being built to recycle waste paper in this city.

$\text{→}$ is/ am/ are being + Ved/ P2

$\text{10.}$ Were your mails being checked when the light went out?

$\text{→}$ was/ were being + Ved/ P2