is being 和are being适合什么时候用?请举例附加提问：过去式could后面不用pat tense 比如：i could dance very well when i was still young..
问题描述：
is being 和are being
适合什么时候用?请举例
附加提问：过去式could后面不用pat tense
比如：i could dance very well when i was still young..
答
这句话是虚拟句
答
i could dance very well when i was still young..
这句对
is being 和are being 主语单复数不同
过去式could后面不用pat tense 吗？ 没看懂
答
is being 和 are being 都是被动语态的正在进行时态 .is 和 are的使用取决与主语的人称数：一般情况下,第三人称单数就用 is ；you 及复数就用 are 了：eg：You/they are being told how to dance by the teacher at ...