...ed	had+...ed
will	would
can	could
must	had to
check	checked
helped	had helped
came	had gone
ago	before
these	those
i will	he/she was going to
may	might
was	had been
don't	didn't
didn't	hadn't had
i'm	was
i'm not	wasn't
have	had
had been	had been
reads	read
should	should
today	the following day
don't	not to
this	that
the	that
here	there
tonight	that night
must be	must have been