*plural subject have been 1 ing
*singular subject has been 1 ing
let's practise the sentences now
1) I have been waiting for a bus since 7 a.m.
2) Nimal has been following a course for several years.
3) It has been raining since morning.
4) They have been repairing the road for several hours.
5) He has been working that office since the year 2000.
6) Doctors have been examining the patients since 8.00 a.m .
7) They have been building a new house since last year.
8) The child has been crying for several minutes.
9 )The principal has been making a speech since 9.00 a.m.
10) Mother has been cooking for several hours .
11)The monk has been preaching the docprine since 8.00 p.m .
12) They have been leaving this area since last year.
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