Chuyển các câu sau thành câu bị động
1. People see the valley from the top of the hill
\(\rightarrow\)
2. The students always erase the chalk board after class
\(\rightarrow\)
3. They keep this room tidy all the time
\(\rightarrow\)
GIÚP MK VỚI MK CẦN GẤP
1. The valley is saw from the top of the hill.
2. The chalk board is always erased by the students after class
3. This room is kept tidy all the time.