is	was
are	were
am	was
have got	had got
has got	had got
have gone	had gone
has gone	had gone
is writing	was writing
will	would
can	could
may	might
should	should
don't	didn't
doesn't	didn't
haven't got	didn't have got
hasn't got	didn't have got
must	had to must
have to	had to have
has to	had to has
go	went
live	lived
went	had gone
today	that day
yesterday	the day before, previous day
tomorrow	the next day, the following day
next week	the following week
last week	the week before, previous week
ago	before
this	that
these	those
here	there
now	then