将以下句子转换成被动句
题目
将以下句子转换成被动句
1.They often take their children to the park.
2.Did you send your invitations last week?
3.You must write thank you letter.
4.The manger will sing the song.
答案
Their children are often taken to the park by them.
Were your invitations sent by you last week?
Thank you letter must be written by you.
The song will be sung by the manager.
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