$1.$ Who are they keeping in the kitchen?

$\rightarrow$ Who are being kept in the kitchen?

$2.$ What books are people reading this year?

$\rightarrow$ What are books being read this year?

$3.$ Nam is milking the cows.

$\rightarrow$ The cows are being milked

$4.$ Sheila is drinking a cup of tea

$\rightarrow$ a cup of tea is being drunk.

$5.$ Mary is cutting the cake with sharp knife

$\rightarrow$ The cake is being cut with sharp knife by Mary.

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Câu BĐ(Passive Voice) thì HTTD :

`+` S + am/is/are + being + `V3` (+ by sb/O)

`-`  S + am/is/are + not + being + `V3` (+ by sb/O)

`?`  Am/is/are + S + being + `V3` (+ by sb/O