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hardly sees his sister sees his sister only at Christmas time sees his sister on Jack’s birthday always sees his sister
play played is playing was playing
, where was Jack where Jack was , where is Jack where Jack is
that; as though when; that while; which where; now that
might have done must have done might be doing must do
is spending spent has spent will spend
only remembers one of Jack’s seventeenth birthdays always sends Jack something on his birthday has forgotten all of Jack’s birthdays has forgotten Jack’s seventeenth birthday
might have done must have done might be doing must do
might have done must have done must be doing must do