It is a form of present tense. It is used to describe the occurrence of an event in the past and its relevance at the present moment. Present perfect continuous tense is defined as an action that started in the past and continues in the present. Firstly, an event that has happened in the past. Secondly, it also hints about the importance of an event or an action happening in the past in the present scenario.
It is a simple tense. Is it that important to know the difference? It is most definitely very important to know the difference between the two. The present participle , being , is used in the passive voice , namely, the passive form of the present continuous or progressive , and the past continuous or progressive.
Classes are being given every day. Sarah is being interviewed for a teaching position as we speak. Here, we clearly see that these actions are in progress in the present, or at the time of speaking; this is why we use the present continuous.
Being is necessary in its passive form. Classes were being given every day. The day I arrived, Sarah was being interviewed for a teaching position. Here, on the other hand, we see that the actions were in progress at a specific moment in the past when I arrived in Denver. But in both continuous tenses we use being in the passive forms.
It is interesting to note that the auxiliary verb was is used in the passive voice too apart from being used in the past tense.
The word have been is used in the present perfect continuous form of any given verb with a plural subject. Now, when you use have been to construct present perfect continuous tense, you mean an action has been going on for some time. It continued from past to the present. The farmers have been cultivating these fields for generations.
In both the sentences, you can see that the usage have been is used as the present perfect continuous form of two different verbs, namely, saying and cultivating respectively.
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