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are的过去式是were。are是be的第二人称单复数现在式，am和is是单数形式；am，is的过去式是was，are的过去式是were。过去分词都是been。
are的过去式例句：
1、We were all badly bitten by mosquitoes.
我们都被蚊子咬惨了。
2、Engineers noticed that the pipes were not expanding as expected.
工程师注意到管道并没有如预期那样膨胀。
3、They were knocking around together for about a year.
他们交往大概有一年了。
are双语例句
Are you aware these notes are counterfeit?
你觉察到这些钞票是伪造的吗？
Clubs are trumps.
梅花是主牌。
Snakes are carnivorous.
蛇都是食肉动物。
No, those are Ellie's kids. Ours are upstairs.
不，那些是埃利的孩子。我们的都在楼上。
Certain courses are compulsory, others are optional.
某些课程是必修的，其他是选修的。