viết lại câu Who took care of your children when you went on business? By........
2 câu trả lời
By whom were your children taken of when you went on business?
-> đổi qua câu bị động
Who took care of your children when you went on business?
`=>` By whom were your children taken off when you went on business?
⇒ Cấu trúc: By whom + was/were + S + V3/-ed + when + S + V2/-ed + O?
⇒ Sau when là thì Quá Khứ Đơn
⇒ your children là danh từ số nhiều `->` Dùng were
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