1.This means(has) been widely （used） now.为什么不是are:used

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1.This means(has) been widely （used） now.为什么不是are:used
2.All(have)changed we hardly recognise each other at once.为什么不是is.

1.
1）means 表示“方式,手段”,作主语时谓语动词用单数形式,类似的单词还有maths,politics,physics 等等.
2）have/has + 过去分词,这是现在完成时态的结构.has后面有been,所以不能用are used.
2.
1） all 作主语：若指人,谓语用复数；若指事物或现象,谓语通常用单数.如：
All are equal before the law.法律面前,人人平等.
All is well that ends well.结局好一切都好.
2）若all 后修饰有其他名词或接有“of+名词”,则其谓语与其中名词的数保持一致.
All (of) the money is mine.所有这些钱都是我的.
All (of) his friends are poor.他所有的朋友都很穷.
3）上句中的all指人,指“我们”,所以谓语动词用have,而不用is.
再问：还没解释清楚（2）中为什么是have而不是are。对了，我还有两道提问回答一下哦http://zhidao.baidu.com/question/232160862.html?quesup1(*^__^*)
再答： have/has + 过去分词，这是现在完成时态，而are/is/am + 过去分词，这是被动语态，被动语态表示“主语被...”。

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