Accused	(by others -- different from False assumption!) -- falsely accused and searching for proof of innocence;  or he's an investigator and she's the main suspect.
Adoption	trying to adopt an orphan;  or long-lost or adopted adult returns;  or adult searches for child given up for adoption.
Amnesia	loss of memory, real or pretended.
Arranged	arranged or forced marriage;  or together because she's pregnant by him.
Bad Boy	(male or female!) -- was once considered a wild kid;  or bad boy, forced to leave town, returns successful.
Blackmail	he blackmails her into becoming his mistress;  or someone else blackmails one of them.
Buddies	they start out as pals, then realize they want more;  or grew up together as best friends, even fixing each other up with dates.
Captive	kidnapped or held hostage by hero/heroine.
Challenge	contest or wager;  or she tries to change his chauvinist beliefs about women;  or she has the memory of his first wife to overcome;  or one of them makes it extremely difficult.
Convenience	mock engagement;  or marriage of convenience.
Cyrano	wooing for another but winning love for self.
Deadline	must complete task before it's too late.
Doctor / Nurse	medical romance.
Duckling	child or tomboy when they first meet, then blossoms;  or initially dowdy;  or plain sister of popular beauty;  or is trained by him (or others) to become ladylike.
Escort	traveling together;  or wagon train;  or he's returning runaway heiress to father.
Fairy tale	story is based on a fairy tale.
False assumption	(between them -- different from Accused!) -- wrong impression of the other;  he thinks she's a prostitute;  or he believes she cheated on him.
Feud	family feud;  Romeo and Juliet.
Fish out of water	overwhelmed at being out of one's element;  city slicker inherits a ranch. (NOTE:   Time-travels don't apply = a "given.")
Forbidden	(different from Feud!) -- cousins; step-siblings;  brother's ex-wife;  there may or may not be a forbidden feel to the story.
Forgiveness	overcoming anger or betrayal.
Friend's spouse	ex:   dying friend asks army buddy to look after wife.
Goal	working together toward the same goal;  join forces to go after outlaw who murdered family.
Guardian	she falls in love with her handsome guardian.
Guilt	overcoming feelings of unbearable guilt.
Handicap / Injury	physically or even emotionally scarred, injured, or handicapped;  nurse back to health.
Hometown	returning to hometown after many years away.
Inheritance	brought together because of a Will or an inheritance.
Kidnapped	(different from Captive!) -- held for ransom by bad guys and rescued by hero/heroine.
Lies	villain/villainess or parent lies to separate them.
Limelight	one of them is famous.
Masquerade	(different from Secret Identity!) -- covering up true identity;  she pretends to be a boy; he's an undercover FBI agent;  she's the new schoolmarm but is secretly a former outlaw;  runaway heiress is his new housekeeper.
Matchmaker	someone else conspires to bring them together.
MayDec	age difference, no matter how small, is part of story.
Mythology	actual mythological figures are in the story.
Neighbors	live next door to each other or within the same apartment building.
Office	work together;  or are rivals in business;  or one works for the other;  foreman on her ranch;  nanny;  photographers competing on a news story;  boss and secretary/assistant.
Opposites	odd couples of any combination;  she's successful and rich, he's happy-go-lucky and poor;  or he's industrialist, she's environmentalist.
Outcast	removed from society;  loner;  hermit;  hated half-breed;  or hated by villagers because his "beloved" first wife died suspiciously.
Psychic	Precognition, mind-reading, ESP, etc. (NOTE:   must be special in a world of non-psychics.   Fantasies or Futuristics -- where they are surrounded by entire races who have psychic abilities -- do not count.)
Rags to Riches	she/he is poor but becomes wealthy/famous.
Rescued	damsel/man in distress;  must be rescued by the other; bodyguard.
Reunited	come together after a long time apart;  separated as teens;  divorced years ago;  find out divorce was invalid.
Revenge	one of them wants vengeance;  her father stole his title and lands.
Runaway	to or from the other;  from being forced into marriage;  or from evil husband or uncle.
Sacrifice	one gives the other up;  or she agrees to marry villain to save her father from debtor's prison.
Secret baby	he never knew he was a father.
Secret identity	(different from Masquerade!) -- Zorro, Scarlet Pimpernel, or [well-known] highwayman.
Single parent	one or both have children;  he needs a nanny for his motherless children.
Spoiled	learns a lesson.
Stranded	cabin during a snowstorm;  shipwrecked on an island;  quarantined together.
Switch	twins;  or lookalike strangers;  time-traveling lands her in another woman's body. (NOTE:   not necessarily impersonating the other.)
Triangle	other man or woman;  heroine has fiancé but loves hero;  or two good men vie for her and she doesn't want to hurt the other one;  or she's not sure which to marry.
Unrequited	one of them has always [secretly?] loved the other;  hero considers her to be one of the guys;  or hero tries very hard to win her back.