33. My mother made this cake yesterday.
⇒ This cake was made by my mother yesterday
34. Lan can't go with us because she has so much homework to do.
⇒ If Lan didn't have so much homework to do, she could go with us
35. "What aspect of learning English do the students find most difficult?" The teacher asked me.
⇒ The teacher asked me what aspect of learning English the students found most difficult
36. My friend began to collect stamps in 2005.
⇒ My friend has collected stamps since 2005
x x x x x x x
1. He built that house last year.
⇒ That house was built ( by him ) last year
2. "Do you want to have some cold drink, Lan?" asked Ba
⇒ Ba asked Lan if she wanted to have some cold drink
3. Because I don't have a pencil, I can't draw a picture.
⇒ If I had a pencil, I could draw a picture
4. My elder brother began learning English 3 years ago
⇒ My elder brother has learned English for 3 years