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Study Guide: Commonly Misspelled Words In IELTS Listening
Source: https://www.fatskills.com/ielts/chapter/commonly-misspelled-words-in-ielts-listening

Commonly Misspelled Words In IELTS Listening

By Fatskills Exam Guides Team — the exam nerds behind 28,500+ quizzes and 2.1M practice questions across 500+ global exams.

⏱️ ~3 min read

In IELTS Listening there are various types of questions such as multiple choice, note completion, matching, labeling a plan or a map, etc.

In IELTS Listening,  you are given one mark for each correct answer, i.e. the correct spelling matters.

You have to be all ears in all parts of the Listening section but spelling mistakes are often made when candidates write their answers to labeling and note completion questions.

You might have to write down such things as key words/phrases, lists, headings/subheadings, numbers/bullet points, names/surnames, places/times/prices, addresses, telephone numbers, stages, etc. 

Single or double letters
Candidates are often confused under pressure and they might make this mistake when they are not sure how many letters to write: one or two. This group of words is the largest.

Here are some examples: 
embarrassment, accommodation, annual, current, account, classroom, attendance, assessment, commencement, dissertation, questionnaire, pepper, blackcurrant, pizza, waterfall, cliff, village, hurricane, mammals, the Philippines, terraced house, employee, attraction, immense, pessimistic, discuss, arrange, immigrate, pottery, collection, billiards, soccer, bungee jumping, football, basketball, volleyball, jet-skiing, balloon, narrow, passenger, paddle steamer, cottage, swimming pool, copper, rubber, cotton, millennium, midday, address, attendant, assistant, curriculum, fulfillment, attitude, passport, commerce, umbrella, traffic jams, opportunity, illiteracy, sufficient, farewell, welfare, satellite, shopping, reference, assumption, affordable, cassette, antenna, business, unnecessary, tomorrow, recommend, process, apparel, parallel, success, possess, different, pepper, misspell etc.

Silent letters
In English there are many letters that are not pronounced in words. However, you have to write them: 

Wednesday, June, science, discipline, conscious, knowledge, foreign, catalogue, environment, government, autumn, column, drought, reliable, renewable, Switzerland, palace, sculpture, insurance, lane, kitchen, colleague, dangerous, luxurious, castle, whistle, knowledgeable, climbing, comb, lamb, breeze, glue, psychologist, fortnight, memorable, confidence, Europe, catastrophe, exciting, plumber, etc.

“ei” or “ie”
When it comes to the combination of these two letters, even advanced learners often make spelling mistakes.

However, you can easily remember how to write the words properly with the help of the following mnemonic: ‘I before E except after C’.

For example:
believe, die, friend, brief, field, hygiene, niece, priest, relieve, thief, experience, etc.
receive, perceive,  ceiling, conceive, receipt, etc.

There are exceptions to every rule in English:
ancient, caffeine, friend, height, leisure, seize, species, weird.

“or” vs “er” in nouns
Watch out when you write the following words:

decorator, professor, doctor, mediator, collector, commentator, actor, sculptor, author, advisor, conductor, tutor, dictator, contributor, investigator, director, educator, narrator, survivor, editor, translator, inventor, counsellor, visitor, operator, spectator, governor, protector, generator, protector, radiator, separator, supervisor, refrigerator, bachelor, senior, junior, etc.
lecturer, driver, runner, prisoner, builder, jeweller, commander, traveller, fertilizer, computer, register etc.

IELTS Listening: Commonly Repeated spellings of Words 

Homophones
These are the words that sound the same. However, their spelling is different. 

Here are the most common pairs of words:
accept: except
plain: plane
peace: piece
scene: seen
stationary: stationery
steal: steel
sauce: source
sore: soar
for: four: fore
their: there: they’re
hour: our
band: banned
capital: capitol
chili: chilly
choral: coral
cite: site: sight
council: counsel
die -dye
discreet: discrete
daft: daught
flue: flew -flu
genes: jeans
hole: whole
marshal: martial
weather: whether
whose: who’s
you’re: your
loose: lose
affect: effect
principle: principal, and many others.

Words that change their spelling when they change form
Many English words are spelled differently when they become another part of speech or when verbs are used in different tenses. 

For example:
benefit: beneficial
influence: influential
circumstance: circumstantial
pronunciation: pronounce
argue: argument
decide: decision
refer: referring
frolic: frolicking
occur: occurred
unity: unify
justice: justify
significant: signify
maintain: maintenance
violent: violence, etc.