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36. 

$\rightarrow$ $\text{These books were bought for my sister}$

$\leftrightarrow$ $\text{Passive voice past simple: S+was/were+V3/ed+by O}$

37.

$\rightarrow$ $\text{Foreign language is learned by us on the computer}$

$\leftrightarrow$ $\text{Passive voice present simple: S+am/is/are+V3/ed+by O}$

38.

$\rightarrow$ $\text{The birthday cake is being cut by Nancy}$

$\leftrightarrow$ $\text{Passive voice present continuous: S+am/is/are+being+V3/ed+by O}$

39.

$\rightarrow$ $\text{The architect who designed these flats has moved to Ho Chi Minh city.}$

$\leftrightarrow$ $\text{Dùng who để chỉ architect}$

40.

$\rightarrow$ $\text{These are the photos which we took when we were in Da Lat}$

$\leftrightarrow$ $\text{Dùng which để chỉ the photos}$

#NGẮN GỌN

#DỄ HIỂU