is that so? (generally rhetorical)
 facial expression;  countenance;  look;  appearance;  expression (vocal, etc.)
 I'm sorry;  my apologies;  may I come in?;  permission;  leave;  dismissal
 to roll up;  to enfold;  to swallow up;  to involve;  to drag into
 enjoyable;  fun;  pleasant;  happy;  delightful
 to take out;  to get out;  to put out;  to reveal;  to submit (e.g. thesis);  to turn in;  to publish
 to slurp;  to sip (loudly);  to sniffle;  to sniff
 to wonder;  to puzzle oneself about;  to feel anxious about;  to suspect;  to doubt
 calm;  composed;  cool;  quiet
 bad;  poor;  poor (quality);  inferior;  evil;  sinful;  ugly
 relatively;  comparatively
 interesting;  fascinating;  amusing;  funny;  enjoyable;  fun
 small quantity;  little;  little while;  short distance
 each time;  every time;  whenever (something happens);  on the occasion of
 nicely;  properly;  frequently;  often;  I'm glad that you ...;  thank you for ...
 quite a chore;  not that easy;  fairly difficult
 to be bewildered;  to be perplexed
 to get used to;  to grow accustomed to;  to become skilled in;  to become experienced at;  to become tame;  to become domesticated
 sense;  sensation;  feeling;  intuition
 happy;  glad;  pleased;  joyful;  delightful;  gratifying
 change;  variation;  variety;  diversity;  inflection;  declension
 only;  merely;  approximately;  about;  just (finished, etc.);  as if to;  (as though) about to
 but;  however;  even;  however;  no matter how;  ... or something;  either ... or ...
 as a child;  when one was a child;  childhood
 trip abroad;  overseas travel
 to take someone (to some place);  to take someone along;  to lead someone away
 to receive;  to take;  to get somebody to do something;  to have in one's pocket (a fight, match);  to contract (a disease);  to catch
 (for something) to have occurred;  to have done (something);  (for something) to happen on occasion
 as (for);  for;  in the capacity of
 that sort of;  that kind of;  like that;  such;  so
 riding;  ride;  spread (of paints);  -seater (e.g. two-seater);  (getting into the) mood;  (entering into the) spirit
 I see;  that's right;  indeed
 bitter smile;  wry smile;  strained laugh;  sarcastic laugh
 a tiny bit;  just a smidgin;  a wee bit;  very slightly
 corridor;  hallway;  passageway
 while;  even though;  despite
 yes;  indeed;  ha!;  what?;  huh?;  sigh
 to sigh;  to breathe a sigh
 suddenly;  casually;  accidentally;  incidentally;  unexpectedly;  unintentionally