it has been very cold this year 为什么用been 启一个什么作用

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• it has been very cold this year 为什么用been 启一个什么作用
• he was always been a good neighbour这句的意思是他一直都是一个好邻居,但是为什么用到Been,也就是说been在这句中是什么意思,起什么作用?不好意思，我打错了。应该是：he has always been a good neighbour.申明下，我知道这句话的意思，我想问的是been在这句中是什么意思，起什么作用？
• 关于“have been”用法的提问本人是一个英语菜鸟.请大虾们帮帮忙.我们都知道have been可以接过去分词表示现在完成时表被动,还可以接现在分词表示现在完成进行时.但我在书上看见了一个句子就是“I have been selfish”,“The weather has been good this year”和“We have been good friends”.请问这是什么用法,请英语中的泰斗们帮帮忙,
• 提问,英语的一些单词、短语、句型用法1、We are all here waiting for Miss Green to come 为什么用to come2、I saw a big dog lying under the tree when walking past the shop为什么不用was walking3、All has been done now.We can go.这里为什么用has?是All为不定代词还是将All看为一个整体还是什么?4、The students were all tired,but none of them stopped to have a rest-Do you want an apple,a banana or a pear?-None,they all look bad为什么用none,不是人和物吗?5、I think he must be in the office now,isn't he?是否情态动词反意疑问句都用be动词?
• “强秦之所以不敢加兵于赵者”,中的"之”是取消句子独立性吗?
• 英语翻译