后面用名词，名词形容词词等
are后面加的如下：
1、are+动词ing构成现在进行时态。
例句：
They said goodbye，little knowing that they were never to meet again.他们告了别，不知道以后再也不会见面了。
2、are+动词的过去分词，构成被动语态，表被动。
例句： You are to report to thepolice.你应该报警。
3、are+由动词ed形式或动词ing形式转化成的形容词，构成系表结构。
例句：The letter is to be handed tohim in person.这封信必须亲手交给他。
第二人称you+are 第一人称复数we+are 第三人称复数they+are 其他复数名词+are(注意：第二人称单复数同形，都为you) 扩展资料
例：You are my good friend. We are in the same class.
They are on the road. The books are on the desk.
are与主语还可缩写。如：
We are= We're， They are =They're， You are = You're。而are与 not可缩写成aren't
