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Chance vs. Opportunity vs. Occasion vs. Possibility: C1 Vocabulary Explained — C1 English vocabulary lesson by Langcom

Chance vs. Opportunity vs. Occasion vs. Possibility: C1 Vocabulary Explained

ラウル・マグイニャ

Langcom 創設者 | ケンブリッジおよびSIELE試験の試験官

7月 12, 2026

C1📚 Vocabulary⏱️ 5 min read
Understanding the subtle differences between chance, opportunity, occasion, and possibility is key for C1 English learners. While they all relate to events or situations, each word carries a distinct meaning and is used in specific contexts. Opportunity refers to a favorable situation to achieve something desired, often implying a positive outcome. Possibility describes whether something might happen, focusing on its likelihood. Chance can mean either a possibility (often random) or a less formal opportunity. Finally, occasion points to a specific time or event, often a special one. Mastering these distinctions will significantly improve your precision and fluency in English.

What is an Opportunity?

Opportunity refers to a favorable time or set of circumstances that makes it possible to do something you want or need to do. It often implies a positive or desired outcome.

  • It is a situation that allows you to achieve a goal.
  • We often talk about ‘taking’ or ‘missing’ an opportunity.
  • It is usually a countable noun.

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When Do We Use Possibility?

Possibility describes the state or fact of something being able to happen or exist. It focuses on the likelihood of an event, without necessarily implying it is good or bad.

  • It indicates that something *may* or *may not* happen.
  • It is often followed by ‘of + -ing’ or ‘that + clause’.
  • It can be countable or uncountable, but often uncountable when referring to general likelihood.

How is Chance Different?

Chance is a versatile word with two main meanings:

  • As a possibility: This refers to the likelihood of something happening, often by luck or accident. It can be formal or informal. There’s a good chance of rain today.
  • として opportunity: This is a less formal way to say opportunity, meaning a favorable time to do something. I had the chance to speak to the CEO.
  • It is often used with ‘get’, ‘have’, ‘take’, or ‘give’.

What Does Occasion Mean?

Occasion refers to a particular time or event when something happens. It often implies a special, important, or notable event.

  • It focuses on *when* something occurs.
  • We often describe occasions as ‘special’, ‘formal’, or ‘memorable’.
  • It is a countable noun.

Key Differences at a Glance

Understanding the context is crucial for choosing the correct word.

  • Use opportunity when there’s a good situation to *do* something.
  • Use possibility when you’re talking about *if* something might happen.
  • Use chance for either a less formal opportunity or a random possibility.
  • Use occasion for a specific time or event.
Summary: Chance, Opportunity, Occasion, Possibility
Word Meaning Key Usage / Collocations
Opportunity A favorable time or situation to do something desired. Often positive. Take/miss/have an opportunity, opportunity to do something.
Possibility The state of something being able to happen or exist; its likelihood. Neutral, focuses on ‘if’. Strong/slight possibility, possibility of doing something, possibility that…
Chance 1. A possibility (often random). 2. A less formal opportunity. 1. Good/slim chance, chance of doing something. 2. Get/have/take a chance to do something.
Occasion A specific time or event when something happens. Often special/formal. Special/formal/memorable occasion, on this occasion.

Examples

  • This new job offers a great opportunity for career growth.
  • There’s a strong possibility that the meeting will be postponed.
  • Did you get a chance to talk to him after the lecture?
  • The wedding was a very special occasion for our family.
  • I missed the opportunity to travel because I was sick.
  • There’s a slight chance of snow tomorrow.
  • We celebrate birthdays on many different occasions throughout the year.
  • The company is exploring the possibility of expanding into new markets.

Practice

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Common mistakes for Spanish speakers

Spanish speakers sometimes confuse chance そして opportunity because ‘oportunidad’ can translate to both. Remember:

  • While chance can mean opportunity, opportunity is generally more formal and emphasizes a favorable situation for a specific goal.
  • Do not use possibility to do. Always use possibility of doing または the possibility that. For example, not There is a possibility to travel, but There is a possibility of traveling または There is a possibility that I will travel.
  • Be careful with prepositions: on this occasion (not ‘in this occasion’), take the opportunity to do something.

よくある質問

What is the main difference between ‘opportunity’ and ‘possibility’?

The main difference is focus: opportunity focuses on a favorable situation to *achieve* something, often positive. Possibility focuses on *whether* something might happen, without judging if it’s good or bad.

Can ‘chance’ be used instead of ‘opportunity’?

Yes, chance can be used instead of opportunity, especially in informal contexts. For example, I had the chance to meet her is similar to I had the opportunity to meet her. However, opportunity often implies a more significant or planned favorable situation.

When should I use ‘occasion’?

Use occasion when you are referring to a specific time or event, especially one that is special, formal, or memorable. For example, a wedding is a special occasion, 、または on this occasion, I will make an exception.

How does understanding these words help with the C1 Advanced (CAE) exam?

Mastering these distinctions is vital for the C1 Advanced (CAE) exam, particularly in the Use of English paper. You might encounter questions in Part 1 (Multiple-choice cloze) or Part 3 (Word formation) where choosing the correct word based on its precise meaning and collocation is tested. For example, knowing whether to use opportunity または possibility can determine if you select the right answer.

著者について:ラウル・マグイニャ

ラウル・マグイニャ氏は、認定Cambridge English試験対策センターである「Asociación Educativa Langcom」の所長であり、 アメリカ. 。語学教育および国際資格認定の分野で10年以上の経験を持ち、25カ国にわたる数千人の学生、教師、教育機関が、ケンブリッジ英語検定、IELTS、TOEFL、およびMichiganの英語資格を取得できるよう支援してきました。.

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