1.The homework was very difficult yesterday.

⇒How was the homework yesterday?

2.She often does the housework after doing exercises.

⇒When does she often do the housework?

3.They are planting some roses in the garden.

⇒How many roses are they painting in the garden?

4.Liz will send these letters to her friends.

⇒Who will Liz send these letter to?

5.They returned to America two weeks ago.

⇒Where did they return two weeks ago?

6.It’s about 1,500 km from Hue to Ho Chi Minh City.

⇒How long is it from Hue to Ho Chi Minh City?

7.I often listen to music in my free time.

⇒What do you often do in your free time?

8.She learns about computers in computer science class.

⇒What does she learn in computer science class?

9.Someone gave some money to Mike.

⇒Whom did someone give money to?

10.She left her suitcase on the train.

⇒Where did she leave her suitcase?

Ex 2

1.→Who started sailing six months ago?

  →When did your cousin start sailing?

  →What did your cousin start doing six months ago?

2.→Who bought two kilos of oranges?

  →How many kilos of oranges did you buy?

  →What two kilos of did you buy?

3.→What did you watch on TV last night?

  →When did you watch a very good film last night?

  →Where did you a very good film last night?

4.→Why was you tired yesterday evening?

  →Who was tired yesterday evening because worked very hard?

  →What is the result of hard work?

5.→Who invited a lot of people to the party?

  →How many people was invited to the party?

  →Where did Mary invited a lot of people to?