`1` My friend's house had to be stayed by me because my house was being decorated.

`=>` Câu này ta có `2` vế bị động

Vế `1`: My friend's house had to be stayed by me 

Vế `2`: because my house was being decorated.

Giải thích vế `1`:

`=>` Công thức của vế `1`

`-` S + had + to  + be + Vpp 

stay `->` stayed

Giải thích vế `2`:

`=>` Bị động QKTD

`(+)` S + was / were + being + V-ing

`-` My house số ít nên + was

decorate `->` decorated

I had to stay at my friend's house because they were decorating my house

`=>` I had to stay at my friend's house because my house was being decorated by my friends

Cấu trúc : S1+ be+PP+by someone