请问英语had been 是什么时态呢?在什么情况下用呢

请问英语had been 是什么时态呢?在什么情况下用呢 had been什么时态 had been doing是什么时态 had been doing 是什么时态? 英语时态区分have done .have been doing.had done.had been doing.有什么 have/has/had加been是什么时态 had been doing是什么是时态? 请问大虾们,这句英语是什么句型,has been 表示什么时态 had been done 用于什么时态? 英语细节问题请教had been had gone had done的区别 还有BE什么情况下会原形出现在句子中 比如 英语时态问题：had painted 、having been painting、having painted分别是什么 peter had always been interested in plants是什么时态,always为什么要放在