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Present perfect continuous
THE PRESENT PERFECT CONTINUOUS TENSE
The name of this tense can sort of make one believe it to be something complicated. There is nothing so very intricate or scaring about it.
First let us see how one is supposed to write this tense accurately.
It is simple. Just write---- has/have + been + -ing form of the given verb.
Having got this clear now we need to know when one should use this tense while speaking and writing.
Suppose you wish to talk or write of an action which happened to begin sometime in the past and since then has been continuously taking place and now also it is taking place (or completed just now) then we must use the Present Perfect Continuous Tense.
We often use this tense with SINCE ( to refer to the point of time from when the action began ) or FOR (to refer to for how long the action has been taking place).
Let's have a go at some examples!
1 She ___________ (sing) thus __________ (since/for) thirty minutes.
The Present Perfect Continuous Tense for this example is obviously has (which agrees with the subject - She) + been + singing
Obviously for is the answer as thirty minutes is ‘amount' of time and certainly not ‘a point of time'.
2 I ____________ (teach) in this school______________ (since/for) 2011.
The Present Perfect Continuous Tense for this example is obviously have (since it agrees with the subject I) + been + teaching
In this case evidently since is the answer for the second blank as 2011 is clearly ‘point of time'
One huge blunder one could commit is to say or write the below given sentence:-
I am working since morning.
While 'since' has been used correctly the sentence is grammatically wrong simply because you can't use since thus with the Present Continuous Tense (IT IS USED FOR AN ACTION HAPPENING NOW).
Since and for must be used either with the Present Perfect Tense or the Present Perfect Continuous Tense
Let's consider the following sentences:-
1 He has served in this institution for some ten years. The tense used is the Present Perfect Tense.What does this sentence mean? It means he has already completed ten years of his service in the institution and is still serving it or maybe it is time for him to hang his boots i.e. the time has come for him to retire from service.
2 He has been serving in this institution for some ten years. The tense used here is obviously the Present Perfect Continuous Tense. What does this mean? He has been serving this institution for the past ten years and he continues to do so even now!
3 He served in this institution for ten years. The tense used in this example is the Simple Past Tense. What does this sentence tell us? Obviously it refers to a past action. It tells us that there was a time when he worked for this institution and he did so all in all for some ten years.
Well, I believe this, much discussion will do fine and now for an exercise on this tense (you need to just successfully write the Present Perfect Tense viz.
has/have + been + -ing form of the given verb ).

English exercise "Present perfect continuous" created by sreedhar with The test builder. [More lessons & exercises from sreedhar]
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