Chuyển thành câu bị động:
11. Take off your hat.
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12. Don’t do that silly thing again.
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13. Let’s tell them about it.
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14. Don’t let the other see you.
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15. I have heard her sing this song several times.
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11 . Your hat must be taken off
12. that silly thing mustn't be done again
13. Let they be told about it
14 .Don't let you be seen by other
15. 15. I have heard her sing this song several times.
11. Your hat must be taken off.
12. That silly thing must not be done again.
13. Let they be told about it.
14. Do not let you be seen by the other.
15. She has been heard to sing this song several times by me.
