第1个回答 2008-01-07
knock before entering
进屋请先前敲门
---will
第2个回答 2008-01-07
Please knock on the door before you step into the house.
参考资料：英语专业 大四学生
本回答被提问者采纳
第3个回答 2008-01-08
请问进屋请先前敲门
Knock before you come in, please.
第4个回答 2008-01-07
Please knock on the door before you come in.
第5个回答 2008-01-07
knock the door before you entre in,please