Have/has been后跟什么?以此为开头的是什么时态

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• Have/has been后跟什么?以此为开头的是什么时态
• have has been 是什么时态的havehas been to
• have has done是什么时态表示现在还在做还是已经做完了?gone to 是到某地还没回来吗?been to 是去了已经回来了吗?表示已经做过的，现在已经做完的用什么说？
• 求懂英语的解释一下这些分别是什么时态1.{isbe {am + p.p（过去分词）{are2.be {was +p.p{were3.have/has been + p.p4.will be + p.pbe going to be + p.p5.must/may/need/can/should/ + be + p.p6.{isbe {am + being + p.p{are
• 时态全还给老师了,这句句子是什么时态?e.g.As its cars guzzle fuel,this car company has decreasing sales figures in recent years.has decreasing属于什么时态?是现在完成进行时吗?可是现在完成进行时的构成是：主语+助动词（have/has）+been+动词的现在分词+其他成分,例句里没有been啊.
• 基本结构：主语+have/has+been+动词ing(V-ing)这是什么时态的结构
• have been doing是什么时态?不要说是过去时间里开始、并持续到现在,一直在进行的（或刚结束的）动作或状态,要说明确,比如：现在进行时例句：--I ‘m sure Andrew will win the first prize in the final examsI think so.He has been preparing for them for months.
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