indicates sentence topic;  indicates contrast with another option (stated or unstated);  adds emphasis
 sky;  air;  ether;  firmament;  the heavens
 indicates possessive;  nominalizes verbs and adjectives;  substitutes for "ga" in subordinate phrases;  (at sentence-end, falling tone) indicates a confident conclusion;  (at sentence-end) indicates emotional emphasis;  (at sentence-end, rising tone) indicates question
 at (place, time);  in;  to (direction, state);  toward;  for (purpose);  because of (reason);  for
 to attack;  to assail;  to succeed (someone in a post, role, etc.);  to make a sudden visit
 to come (spatially or temporally);  to approach;  to come back;  to do ... and come back;  to come to be;  to become
 eye;  eyeball;  eyesight;  sight;  look;  stare;  notice
 demon;  devil;  evil spirit;  -crazed person;  -obsessed person;  fiend
 to throw down;  to bring down;  to kill;  to defeat;  to overthrow;  to trip up
 to revive;  to come to oneself;  to be restored to life
 good;  advantage;  sake;  purpose;  consequence;  result
 Kamen Rider (TV series, the titular character)
 to become;  to get;  to result in;  to turn out;  to consist of;  to be composed of;  to be completed
 hero;  heroine;  Eroica Symphony (Beethoven, 1804);  Heroic Polonaise (Chopin)
 indicates direct object of action;  indicates subject of causative expression;  indicates an area traversed;  indicates time (period) over which action takes place;  indicates point of departure or separation of action;  indicates object of desire, like, hate, etc.
 to collect;  to assemble;  to gather
 indicates sentence subject (occasionally object);  indicates possessive (esp. in literary expressions);  but;  however;  regardless of;  whether (or not)
 to be added to;  to be appended;  to join in (e.g. a group of friends);  to participate;  to increase (e.g. heat);  to gain in (e.g. influence)
 newton (N) (SI unit of force);  Newton (Sir Isaac)
 state;  state of affairs;  appearance;  look;  sign;  indication
 strange;  odd;  unexpected;  change;  incident;  disturbance
 be;  is;  did;  (have) done;  please;  do
 to leave (behind);  to leave (undone);  to not finish;  to save;  to set aside;  to leave (to someone, esp. after one's death)
 time;  hour;  period;  class
 behind;  rear;  after;  later;  remainder;  the rest;  more (e.g. five more minutes)
 Sunday;  day (of the month);  counter for days;  Japan
 going out (of a nobleman, etc.);  visiting
 (what) the heck;  (why) in the world;  one object;  one body;  one form;  one style
 where;  what place;  how much (long, far);  what extent
 now that you mention it;  come to think of it;  that reminds me;  on that subject;  speaking of which
 truth;  reality;  sincerity;  honesty; (arch.)  that's right
 too;  also;  both A and B;  A as well as B;  even;  as much as
 from (e.g. time, place, numerical quantity);  since;  from (originator);  by;  because;  since;  out of (constituent, part)
 light;  illumination;  glow;  lamp;  light
 ah!;  oh!;  yes;  indeed;  aah;  gah