1.第一句楼主应该是问疑问句吧.Is this her house?
2.否定简答：NO,it isn't (my dress).
3.倒装：Here is your pencil.this is her house句变否定句怎么写？否定句：This isn't her house.在问一下：thank you veyy much 回答此句这个嘛，回答方式有好几种，比如：Don't mention it. That's all right. My pleasure.等等当然最常用的还是这句：You 're welcome.