An enigma is something that won't be easily explained — a riddle, a puzzle, a mystery that nags at you. This unit plays with the language of mystery: the wordplay of a telephone call where every name sounds like another word, the unsolved disappearances of the Bermuda Triangle, and the irregular plurals that are little puzzles in themselves (why leaf → leaves but roof → roofs? why goose → geese but not "gooses"?).
The grammar that fits is irregular plurals — the words that refuse to just add -s — and homophones, words that sound the same but mean different things (the engine of the whole telephone joke). You will write the opening of a mystery story, a data-sheet description, and a 200-word "Mystery of…" article.
A caller asks to speak to "Annie Wun", and the operator, hearing "anyone", keeps offering herself. The whole joke rides on homophones — words that sound identical but carry different meanings. Read each name aloud and you hear the second meaning hiding inside it: Annie Wun = anyone, Sam Wun = someone, Noe Wun = no one, Avery Wun = everyone, Saw Ree = sorry. The operator keeps hearing the everyday word while the caller means the name, and the confusion snowballs.
It's silly — but it teaches something real: English is full of words that your ear can't tell apart, so meaning depends on context and, in writing, on spelling. That's exactly why the homophones grammar box matters.
A data sheet is a skeleton — the bare facts laid out in rows, ready for you to clothe in sentences. When the exam asks you to "use the information to write a description", your job is to turn each row into prose, in a sensible order: what and where → shape and size → what happens → famous case → explanations → the twist. Notice how the last two rows set up a little drama: the mystery, then the cool scientific verdict that there's no mystery at all. That contrast is a gift — it gives your description a satisfying ending.
| Field | Detail |
|---|---|
| Location | Atlantic Ocean — between Bermuda, Puerto Rico and Florida |
| Shape | roughly triangular, around 500,000 square miles |
| Phenomenon | a number of mysterious plane and boat disappearances have occurred |
| Famous incidents | Flight 19 (1945), the USS Cyclops, the MS Marine Sulphur Queen |
| Possible explanations | magnetic anomalies, methane gas eruptions, freak waves, human error |
| Scientific consensus | statistics show the area is no more dangerous than other busy shipping routes |
Note: the mind map for this unit lists other famous world mysteries — the Loch Ness Monster, Stonehenge, the Mary Celeste, Easter Island, Sigiriya's mirror-wall graffiti, and Amelia Earhart's disappearance. None of these appear in the Unit 9 lesson text, which focuses only on the Bermuda Triangle, so treat that list as general-knowledge extension rather than examined unit content.
Most English plurals are easy — just add -s. The trouble is the rebels, a small crowd of words that change shape in their own stubborn ways. The honest truth is that half of them have no rule — you simply have to know them, the way you know that "goose" becomes "geese" and never "gooses". But the other half do fall into patterns, and spotting the pattern makes the list far less frightening.
The biggest pattern is the -f → -ves swap: a leaf becomes leaves, a knife becomes knives, a wife becomes wives — the soft "f" turns into a buzzing "v". But beware the traitors that just add -s (roof → roofs, chief → chiefs, belief → beliefs); there's no logic, only memory. Then there are the vowel-changers that transform from the inside (foot → feet, tooth → teeth, man → men), the rare -en plurals (child → children, ox → oxen), and the lazy no-changers that look the same singular or plural (sheep, deer, fish, aircraft).
| Pattern | Examples |
|---|---|
| -f/-fe → -ves | leaf→leaves, elf→elves, loaf→loaves, shelf→shelves, calf→calves, wife→wives, knife→knives, life→lives |
| Exceptions (-fs only) | roof→roofs, chief→chiefs, belief→beliefs, gulf→gulfs, scarf→scarves/scarfs |
| Vowel change | foot→feet, tooth→teeth, goose→geese, man→men, woman→women, mouse→mice, louse→lice |
| -en plurals | child→children, ox→oxen |
| No change | sheep, deer, fish, aircraft, series, species, means |
| Latin / Greek | fungus→fungi, nucleus→nuclei, bacterium→bacteria, phenomenon→phenomena, analysis→analyses, datum→data |
| Compound nouns | father-in-law→fathers-in-law, passer-by→passers-by |
One sneaky one to remember: in a compound noun, you pluralise the important word, not the last word — it's "fathers-in-law" (more than one father), not "father-in-laws". The plural lands on the noun that's actually being counted.
The Annie-Wun joke was funny because of homophones — but in the exam these same look-alike words are where careless marks vanish. Your ear can't tell "their" from "there" from "they're"; only your understanding of the meaning can. So the way to master them isn't to memorise spellings blindly — it's to lock each spelling to its meaning, so that when you write the sentence, the meaning picks the spelling for you.
Take the three worst offenders. Their shows belonging ("their books"), there points to a place ("over there"), they're is just "they are" squashed (the apostrophe is the giveaway — it always means a missing word). Same trick with its / it's: the apostrophe means "it is", so no apostrophe means belonging.
| Pair | Meaning |
|---|---|
| their · there · they're | belonging to them · in that place · they are |
| your · you're | belonging to you · you are |
| its · it's | belonging to it · it is |
| to · too · two | direction · also/very · the number 2 |
| weather · whether | rain/sun · if |
| principal · principle | head of school · a rule/belief |
| stationary · stationery | not moving · pens/paper |
| peace · piece | quiet · a part |
Two memory hooks that stick: the principal is your pal (the head of school); stationery with an e is for envelopes and pens. Build a little hook like that for each pair you keep getting wrong.
A mystery opening has one job: make the reader need to know what happened. The model paragraph "The Silent Village" does it not by explaining anything but by planting concrete clues that don't add up — a broken kite, boarded shops but full wells, goats in the road, no dogs, and the killer detail: a kettle still warm on dead ashes. Each image raises a question without answering it. It appeals to the senses and ends on a deliberate hook — "somebody had been there ten minutes ago… and had left." It even slips in the unit's grammar ("somebody had been there… had left" — past perfect for the earlier action).
The model description of the Bermuda Triangle is a master-class in turning a data sheet into prose. It walks the rows in order but never reads like a list, because each fact is wrapped in a full sentence with connectors ("bordered by", "the most famous being", "in fact"). The clever move is the structure of tension then release: it builds the mystery and then deflates it with the cool statistic ("no more dangerous than any other shipping route") before a final wink ("still… one of the world's favourite enigmas").
| Task | Official word count / shape |
|---|---|
| Notice (Test 6) | 40–50 words |
| Short paragraph (Test 8) | 50–60 words |
| Mystery-story opening | ~80 words — hook → sensory scene → clues that don't add up |
| Description / data sheet (Test 14) | ~100 words — location → shape → famous incident → balance of fact & mystery |
| Mystery story (Test 16) | ~200 words — hook → sensory scene → one fresh clue → ambiguous final line |
Irregular plurals and homophones are quiet spelling-and-grammar marks scattered through the word-box and fill-in passages — easy to gain, easy to lose. Mystery and "deserted house" story prompts come round regularly, so the suspense-building practised here is worth drilling. Data-sheet-into-description is a standard Test 14 shape.
| Past-paper test | What was tested |
|---|---|
| 2018 Test 4 | Match titles to a textbook contents — note-making skill, often mystery genre |
| 2015 Test 15 | Comprehension on a circle of grapes — moral mystery |
| 2019 Test 11 | Word-box on Sudara / wise-man story |
| 2017 Test 16 (d) | Story prompt: 'As I approached the deserted house...' |
| 2018 Test 11 | Plural / connective fill-in |