had being doing是什么时态
had being doing这是过去完成进行时；
表示从过去的某一个时间点开始做某事一直持续到过去的某个时间点并且仍在执行。
being
n. 存在；生物；身心；生活，有生命；本质
adj. 存在的
v. 存在；在场；从事；就是；代表（be 的现在分词）
[ 复数 beings ]
例句
I think we\'re being followed.
我认为有人跟踪我们。
He just hates being housebound.
他只是痛恨出不了门。
Sorry, I was being frivolous.
对不起，我失态了。
He can\'t endure being defeated.
他无法忍受失败。