Passive with Must for Necessity

Active Voice 

1. Tola cut a tree yesterday.
2. We eat apples every day.
3. They can meet us tomorrow. 
4. We must help that baby. 

Passive Voice

1. A tree was cut yesterday by Tola. 
2. Apples are eaten by us every day. 
3. We can be met by them tomorrow. 
4. That baby must be helped by us. 

Active voice

She needs two apples.                            Subject + V [t] + object.

Passive voice

Two apples are needed by her.                Subject + be + V p.p. + by + object. 

Practice: Make the following sentences passive.

•     She must buy that pen. 
•     That pen must be bought by her.

See the video below for explanation in Khmer.