三人行，必有我师也。择其善者而从之，其不善者而改之。本页是勤劳的小编给家人们收集的4篇are的过去式的相关文章，希望对大家有一些参考价值。
become与be是常用的系动词。其区别是：
1、become是非延续性动词，不可与表示延续性的时间状语连用；而be则是延续性动词，可表示状态，能与表示延续性的时间状语连用。
2、become不可用于被动结构；而be则可用于被动结构。
3、become不可接动词不定式；而be则可接动词不定式。
They were bosom buddies.
他们曾是知心的伙伴。
Both women were French.
两名妇女都是法国人。
They were Unitarians.
他们是上帝一位论者。
例句：
The doors were padlocked.
门都用挂锁锁着。
They were bosom buddies.
他们曾是知心的伙伴。
Both women were French.
两名妇女都是法国人。
These figures have been disputed.
有人对这些数字提出了质疑。
Whatve you been up to?
你一直在搞什么名堂？
Youve been very kind.
你真是体贴入微。
I didnt use to like him much when we were at school.
以前我们同学时，我并不太喜欢他。
With the coming of modern technology, many jobs were lost.
随着现代技术的'到来，许多工作岗位不复存在。
All the statistical computations were performed by the new software system.
所有的统计计算均由新的软件系统完成。
A number of measures were taken to alleviate the problem.
采取了一系列措施缓解这个问题。
No payments were made last week because of a computer error.
由于计算机出错，上周未付任何款项。