It isn't necessary for us to know the causes of homeless什么意思?

It isn't necessary for you to come tonday的同义句 It isn't necessary for us to know the causes of homeless什么意思? no,it isn't isn't it nice say it isn`t 英语翻译Isn't it dangetous a isn't ball it isn' t it怎么读 Isn’t it a something? Say It isnt Sohsgsgssg “say it isn't so” Isn't it great翻译 I know it isn’t isn't it?是什么意思啊 Small world ,isn't it Do you have to buy this hat?No,I________.It isn't necessary.(a)mustn't (b)won't (c)needn't (d)don't need选择哪一个,为什么? It isn't a find day,isn't?中有没有错 isn't there和isn't it的区别