Chuyển câu chủ động sang bị động: I knew that they had told him of the meeting.
Đáp án: It was known that they had told him of the meeting. / They were known to have told him of the meeting.
Giải thích: Cấu trúc:
- S + knew + (that) + ... = It was knew that + ... ( thì quá khứ đơn)
- S + knew + (that) + ... = S + tobe + known + to have + P2 + ... (Trường hợp vế 1 khác thì với vế 2)
Dịch: Tôi biết rằng họ đã nói với anh ấy về cuộc họp. = Tôi được biết rằng họ đã nói với anh ta về cuộc họp. / Họ được biết là đã nói với anh ấy về cuộc họp.
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