Student or Learner
a) He has put on weight,grown a beard and changed.
b) He has put on weight,has grown a beard and has changed.
a) They have been sitting,talking and having a good time.
b) They have been sitting,have been talking and have been having a good time.
I think the two 'a' examples are correct but is it possible to use 'has/have' and 'has/have been' before every verb in a sentence?