过去时态时,there were sb 接doing还是什么?

过去时态时,there were sb 接doing还是什么? 关于There be sb/sth doing句型如果是过去时态怎么办?be动词要不要变成was、were?后面的doing怎么办? was/were+过去分词是什么时态 When were you there.为什么用were表达的意思怎么会是过去时 the beach there were pretty.这句话一定理解为是过去时态吗最近很困惑于were的用法如果想表达“那个沙滩很漂亮” 能不能说the beach there were pretty.还是一定要用are 英语翻译要过去时态的!went,were,was. was/were+been+动词的过去分词是什么时态 found sb doing sth 是什么时态 e.g i found him reading a book .是一般过去时还是过去进行时 what were you doing yesterday afternoon?用什么时态?（过去时态还是过去进行时态）?快 How long were you there.为什么用were 从意思上我看不出来是过去时啊` how long were you there 是什么时态,能等于什么 i was at home last night.这事一个过去时态的句子.这里为什么不用were 呢,我记得过去时am变成were 而is 变成was啊这里明显i后面填were啊请求帮助 what were you doing at four o'clock yesterday afternoon?回答用是过去时态还是过去进行时态?为什么? 英语作文时态First we saw three giant elephants.On the tree,there are many birds.They were yellow and red,they are beautiful.They are singing happily.为什么They were yellow and red用过去时,而they are beautiful又不用呢?还有They are 请问do you think they were five如何翻译呢?为什么要用过去时态were? There be 三时态的句子（一般时,过去时,将来时）每个写3个例句 There were some apples on the desk just now为什么有now还用were,now是现在进行时标志,were是过去时, 帮我看看这句简单的英语时态There was be going to thunderstorm!请问为什么这句话要用过去将来时?我怎么看不出这句话有过去的时态呢?除了复数和第二人称一律用were,其它的都用was么?比如there（那