Tenses
The word ‘tense’ is derived from Latin word ‘tempus’
and it means time. Basically tense conveys the time of action. 
Tenses are mainly divided into three parts –
Present, Past and Future. They are further subdivided into four categories –
Indefinite, Continuous, Perfect and Perfect Continuous.
PAST
PERFECT CONTINUOUS TENSE
PAST PERFECT CONTINUOUS TENSE (also called Past
Progressive Tense) is generally used for an action which began at some time in
past and continued for some time in past. It usually emphasises duration or the
length of time that an action took. This tense shows that the action mentioned
in the sentence was continuously happening for a period of time in past / the
time being reported / talked about. 
Basic
Structure of Sentence in the Tense
Basic structure of a sentence in this tense is – 
Subject +   Had
+         been  +       base
verb + ing (V1+ing) +   object
I                  had             been           reading                          the book.
She             had             been            working
on a project. (affirmative)
He              hadn't
        been            showing progress.
(negative)
Had            she
             been            wasting her time?
(interrogative)
Past
Perfect Tense is used to describe/show/denote  – 
1.
Something that started in past and continued for some period/duration in past– 
For example :
He had been working on the project for a year when
he was fired. (started in past and continued for some period in past)
She had been sleeping for two hours when I rang her
up.
2.
To denote an action continued before another action in past –
  
For example – 
They had been talking for over an hour before Tom arrived.
(action continued before another action in past)
Shankar had been wasting his time in video games
before he met his new teacher.
3.
To denote an action that began in past and continued up to that moment, till
the time being talked about – 
I was irritated because he hadn’t been working at
all. (in sequence with Simple Past Tense)
I did not know he had been doing an important
project on History of India that time.
4.
To emphasise long continuation of an action – 
For example – 
Mother had been working all day despite her
sickness. (emphasis is over the length/duration)
I had been waiting for you all through the night.
Prepositions
(for/since) used with certain time expressions:
Since
–
used to denote point of time when some work/action began.
For
–
used to denote for total duration of some work/action
More
adverbs/adverb phrases used as time expressions with since/for:
When                   at
that time           all
the day
before                  after                     that time
morning              childhood           for an year
since 1990          whole
day           since I was a child
for four days       for
three weeks   since the time 
Verb
form used in the Present Perfect Continuous Tense– 
The past perfect continuous form of a verb consists
of three elements:
1. Past form of auxiliary verb ‘have’ – had (both
plural and singular)
2. Third form of be – been
3. Present participle form of main verb (Verb 1+ing) – playing, going, reading, working, cooking, etc.
More such verbs (not to be used in Present Perfect Continuous Tense)
 feel                               hear                               have 
 smell                            measure                         assume
 believe                          consider                        seem
 
find                                suppose                         forget                   
imagine               
         know                                mean          
recognise                       remember                      understand 
fear                                hate                                hope 
 love                              mind                              prefer
wish           
                   cost                                hold
More examples :
1. My mother had been working for 4 hours when I
reached home.
2. I had been working in this firm for 6 years when
I was suspended.
3. At that time I had been studying in the college
for 3 years.
4. It had been raining for 3 days when we were stuck
in jam. 
5. They had been talking for an hour before they
left for Jaipur.
6. What had you been doing there when I called you?
7. Mr. Joshi had been teaching in this school for 20
years when he retired.
8. Father scolded him as he had been sleeping the whole morning.
          
Exercise
for practice
1.    She
____________  in this company for three
years when she got transferred. (work)
2.    He
______________ from Malaria for a long time before he recovered. (suffer)
3.    Sohan
____________ whole afternoon that’s why he was exhausted. (bat)
4.     I asked him why he ___________ for the
competition in the beginning. (prepare)
5.    My
parents _________ for the case in court for four years when I met with an
accident. (fight)
6.    Earlier,
people _____________ for a long time that the earth was flat. (believe)
7.    The
students _________ for 15 days when the programme was cancelled. ( practise)
8.    My
condition did not improve though I  _________ medicines regularly for a year. (take)   
 Video on Past Tense  
Answers
:
1.    Had
been working                            2. Had been suffering            
3. Had been batting                              4. Had not been preparing              
5. Had been fighting                              6. Had been believing
7. had been practising                          8. Had been taking        

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