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A1 numeral 12分で読める

thirty

例文
解説 thirty in your Level:
At the A1 level, learning the word thirty is an essential step in mastering basic English counting and communication. Thirty is the number that comes after twenty-nine and before thirty-one. It is written as the digits 3 and 0. Beginners use this word to talk about everyday things like their age, the time, and money. For example, if someone asks 'How old are you?', you might answer 'I am thirty years old.' When looking at a clock, you will use thirty to tell the time, such as saying 'It is ten thirty' when the time is 10:30. In a store, if you want to buy a shirt, the price might be thirty dollars. Learning to count by tens (ten, twenty, thirty, forty) is a very important skill for A1 learners. It helps you understand larger numbers and makes shopping, traveling, and talking about time much easier. You should also practice the pronunciation carefully. Make sure you put your tongue between your teeth to make the 'th' sound, and emphasize the first part of the word so people do not confuse it with the word thirteen. Knowing the word thirty allows you to participate in simple conversations about daily life, schedules, and basic mathematics.
At the A2 level, your understanding and use of the word thirty expands beyond simple counting and telling time into more practical, everyday situations. You will start using thirty in combination with other numbers to form compound numbers like thirty-one, thirty-five, and thirty-nine. You will also use it more frequently when discussing routines, schedules, and durations. For instance, you might say, 'I need thirty minutes to finish my homework,' or 'The bus ride takes about thirty minutes.' In shopping and transactional contexts, you will hear and use thirty to discuss prices, discounts, and quantities, such as 'This jacket costs thirty euros,' or 'There is a thirty percent discount on all shoes today.' Furthermore, you will begin to recognize thirty in dates, particularly knowing that months like April, June, September, and November have exactly thirty days. This knowledge is crucial for making appointments and planning holidays. A2 learners also start to understand the difference between exact numbers and approximate numbers. You might use phrases like 'around thirty' or 'about thirty' when you are not completely sure of the exact amount. Practicing the clear pronunciation of thirty remains important at this level to ensure smooth and clear communication in these everyday scenarios.
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At the B1 level, the word thirty becomes a versatile tool in your vocabulary, allowing you to express more complex ideas related to time, age, and measurements. You will confidently use phrases like 'half past' as an alternative to saying thirty when telling time, demonstrating a more natural grasp of conversational English. When discussing age, you will understand and use expressions like 'in his thirties' or 'in her early thirties' to describe someone's stage of life without knowing their exact age. This is very common in social conversations and when describing people. You will also encounter thirty in professional and educational contexts, such as discussing a 'thirty-page report' or a 'thirty-minute presentation.' At this level, you should be comfortable using thirty as a compound adjective, remembering the grammatical rule to use a hyphen and keep the noun singular, as in 'a thirty-day warranty' or 'a thirty-year-old man.' Additionally, B1 learners will start to hear thirty used in common idioms and cultural references, such as the historical period known as 'the thirties' (the 1930s). Your ability to distinguish between thirteen and thirty in fast-paced listening exercises should be highly accurate by this stage, allowing for seamless comprehension in both casual and formal dialogues.
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At the B2 level, your use of the word thirty is expected to be highly accurate, fluent, and nuanced. You will utilize thirty effortlessly across a wide range of topics, including statistics, economics, history, and detailed personal narratives. In professional environments, you might discuss 'thirty-day payment terms,' 'a thirty percent increase in revenue,' or 'a thirty-year fixed-rate mortgage.' You will understand the cultural significance of turning thirty, often viewed in Western cultures as a major milestone marking the end of youth and the beginning of full adulthood, and you can participate in discussions about this transition. You will also frequently encounter references to the 1930s in literature and historical texts, understanding the socio-economic context of the 'Dirty Thirties' or the Great Depression. At this level, you are comfortable with approximations and colloquialisms, easily using terms like 'thirty-something' to describe a demographic group or an individual. Your pronunciation should be native-like, effortlessly producing the alveolar tap (in American English) or the clear 't' (in British English) depending on the accent you are targeting. You will also recognize thirty in sports contexts, such as the scoring system in tennis (fifteen, thirty, forty), demonstrating a broad and culturally integrated understanding of the word.
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At the C1 level, the word thirty is fully integrated into your advanced vocabulary, and you can employ it with the precision and subtlety of a native speaker. You will use it in complex statistical analyses, demographic discussions, and sophisticated academic writing. You understand the profound sociological implications of the 'thirty-something' demographic, often discussing their consumer behavior, career trajectories, and societal impact. In historical and political discourse, you can critically analyze events from the 1930s, discussing the geopolitical tensions of the era with fluency. You are adept at using thirty in various idiomatic and specialized contexts, such as legal jargon (e.g., 'thirty days' notice') or journalistic reporting. Your command of the language allows you to play with the word stylistically, perhaps using it metaphorically to emphasize a significant quantity or a critical threshold. You are fully aware of the regional variations in pronunciation and usage, and you can adapt your speech accordingly depending on your audience. At this advanced stage, thirty is not just a number; it is a conceptual tool that you use to structure complex arguments, convey precise data, and articulate nuanced observations about time, age, and society.
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At the C2 level, your mastery of the word thirty is absolute, reflecting a deep, near-native intuition for its phonetic, grammatical, and cultural dimensions. You can effortlessly navigate highly specialized texts where thirty might appear in abstract mathematical theorems, complex financial derivatives, or intricate legal statutes. You appreciate the literary and poetic significance of the number, recognizing its use in classic literature to symbolize the passing of time, the loss of youth, or the onset of maturity. For instance, you can engage in profound discussions about how authors use a character's thirtieth birthday as a narrative device to trigger an existential crisis or a moment of profound self-reflection. You are also capable of understanding and generating subtle humor or irony related to age and the number thirty. Your pronunciation is flawless, and you can seamlessly switch between different regional accents if necessary, fully understanding the sociolinguistic implications of how the word is articulated in different English-speaking communities. At this pinnacle of language proficiency, your use of thirty is characterized by complete grammatical accuracy, profound cultural awareness, and exceptional rhetorical flexibility, allowing you to use this simple numeral to convey highly complex and sophisticated concepts.
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例文
The word thirty represents a fundamental numerical value in the English language, serving as the cardinal number that immediately follows twenty-nine and precedes thirty-one. In mathematical terms, it is the product of three and ten, a highly versatile integer that appears constantly in our daily lives. When we consider the profound implications of this numerical value in our everyday existence, we must acknowledge that the concept of thirty extends far beyond mere mathematics. It permeates our understanding of time, as half of an hour consists of exactly thirty minutes, a measurement we use continuously to structure our daily schedules, appointments, and routines.
Mathematical Definition
Thirty is an even composite number composed of the prime factors two, three, and five.
Furthermore, in the context of human development and societal expectations, reaching the age of thirty is often viewed as a significant psychological and cultural milestone. It marks a definitive transition from the exploratory phase of young adulthood experienced during one's twenties into a more settled, responsible, and mature phase of life.

My sister recently celebrated her thirty birthday with a large party.

In the realm of calendars and timekeeping, thirty is equally crucial. Four of the twelve months in the Gregorian calendar—namely September, April, June, and November—contain exactly thirty days. This structural consistency helps us organize our fiscal years, academic semesters, and personal planning.
Timekeeping Usage
It is used to indicate the halfway point of an hour, often referred to as half past.
People use the word thirty in countless everyday scenarios, from discussing the speed limit in a residential neighborhood to determining the temperature on a warm summer day in Celsius or a freezing winter day in Fahrenheit.

The speed limit in this residential area is strictly thirty miles per hour.

When shopping, you might find that an item costs thirty dollars, or you might receive a thirty percent discount during a seasonal sale. In sports, particularly in tennis, the number thirty represents the second point gained by a player in a standard game.

The current score in the tennis match is fifteen to thirty.

The versatility of this word makes it one of the most frequently spoken numerals in the English language. Whether you are counting objects, measuring distances, tracking time, or discussing finances, the word thirty is absolutely indispensable.
Financial Context
It frequently appears in pricing, discounts, and mortgage terms, such as a thirty-year fixed-rate mortgage.
It is also worth noting that the pronunciation of thirty can vary significantly depending on the regional dialect of the speaker. In American English, the middle consonant is often pronounced as an alveolar tap, making it sound somewhat like a soft 'd', whereas in British English, the 't' sound is usually more clearly enunciated.

We have exactly thirty days left to finish this comprehensive project.

Understanding how and when to use this word correctly will greatly enhance your ability to communicate effectively in English, allowing you to convey precise quantities and measurements with absolute confidence.

There were over thirty people waiting in line outside the popular bakery this morning.

Using the word thirty in sentences is generally straightforward, as it functions primarily as a cardinal number modifying a noun or acting as a pronoun when the noun is implied. To construct grammatically correct sentences, you must understand its role within the sentence structure. When used as a determiner or adjective, thirty directly precedes the plural noun it quantifies. For example, you might say that you have thirty books on your shelf or that the recipe requires thirty grams of sugar.

The teacher handed out thirty assignments to the students in the classroom.

Plural Noun Agreement
Because thirty represents a quantity greater than one, the noun it modifies must always be in its plural form.
It is crucial to remember this pluralization rule, as saying 'thirty book' instead of 'thirty books' is a common grammatical error for beginners. Furthermore, thirty can be used in compound numbers, such as thirty-one, thirty-two, up to thirty-nine. When writing these compound numbers out in words, standard English grammar dictates that you must use a hyphen to connect the tens place with the ones place.

My father is thirty-five years old today.

In addition to quantifying nouns, thirty is frequently used in expressions related to time. You will often hear sentences where thirty indicates minutes past the hour.
Time Expressions
In digital time reading, you state the hour followed directly by thirty, such as seven thirty.

The train is scheduled to depart the station at exactly four thirty in the afternoon.

Another common usage is when referring to a specific decade. When people talk about 'the thirties', they are usually referring to the period of time between the years 1930 and 1939, a decade known for significant historical events such as the Great Depression. In this context, thirties acts as a plural noun and is often capitalized depending on the style guide being used.

Jazz music was incredibly popular throughout the nineteen thirtys.

Age References
You can use the phrase 'in his thirties' or 'in her thirties' to describe someone whose age is between thirty and thirty-nine.

We will take a short thirty-minute intermission before the second act begins.

Mastering these various sentence structures will ensure that your use of the word thirty is both natural and grammatically impeccable across all contexts of English communication.
You will encounter the word thirty in almost every conceivable environment where English is spoken, as numbers are foundational to human communication and daily logistics. One of the most prevalent contexts is commerce and retail. When you walk into a grocery store, a clothing boutique, or an electronics shop, you will constantly hear prices being quoted. A cashier might tell you that your total comes to thirty dollars and fifty cents.

That beautiful winter coat is on sale for only thirty euros.

Retail Environments
Prices, discounts, and return policies frequently utilize this number, such as a thirty-day money-back guarantee.
Another environment where thirty is ubiquitous is in transit and travel. Whether you are catching a bus, waiting for a flight, or driving on a highway, time and distance are constantly measured in increments of thirty. Flight attendants might announce that the plane will be landing in thirty minutes, or a GPS navigation system might instruct you to take an exit in thirty miles.

The next train to London will depart from platform four in thirty minutes.

Workplace Scheduling
Calendar invitations and meeting durations are heavily reliant on thirty-minute intervals.
The realm of sports and fitness is yet another domain where thirty is frequently spoken. In fitness classes, an instructor might tell you to hold a plank position for thirty seconds or complete thirty repetitions of an exercise. In American football, you might hear about the thirty-yard line.

The quarterback was tackled aggressively right on the thirty-yard line.

You will also hear this word frequently in casual social interactions, particularly when discussing age. Turning thirty is a major cultural event in many Western societies, often accompanied by celebrations, reflections on youth, and jokes about getting older.
Social Milestones
The transition from one's twenties to their thirties is a popular topic in media, literature, and everyday conversation.

She felt a sudden wave of anxiety as her thirtyth birthday rapidly approached.

Finally, weather forecasts frequently utilize this number. Depending on whether the broadcast uses Fahrenheit or Celsius, hearing the word thirty can evoke completely different expectations about the climate.

The meteorologist predicts that temperatures will soar above thirty degrees Celsius tomorrow afternoon.

From the grocery checkout line to the boardroom, and from the sports field to the evening news, thirty is an indispensable part of the everyday English lexicon.
When learning the English language, one of the most persistent and common mistakes involving the word thirty is confusing it with the word thirteen. This confusion stems from both phonetic similarity and orthographic resemblance. Both words begin with the 'th' sound (the voiceless dental fricative) and contain the 'ir' vowel sound, followed by a 't'. However, the stress and the ending of the words are entirely different.
Pronunciation Stress
In thirty, the stress falls heavily on the first syllable (THIR-ty), whereas in thirteen, the stress falls on the second syllable (thir-TEEN).

Make sure you pay exactly thirty dollars, not thirteen dollars, for the admission ticket.

Mispronouncing these words can lead to significant misunderstandings, especially in financial transactions or when exchanging phone numbers. A cashier might charge you thirty dollars instead of thirteen, or you might show up for an appointment at the wrong time. Another frequent mistake relates to spelling. Because the English language is notorious for its irregular spelling rules, learners sometimes misspell thirty as 'thirtey', 'thierty', or 'tirty'.
Spelling Errors
It is essential to memorize the specific sequence of letters: t-h-i-r-t-y, noting the absence of an 'e' before the 'y'.

The student misspelled the word thirty on his final mathematics examination.

Grammatically, a common error occurs when learners attempt to use thirty as an adjective modifier but incorrectly pluralize the noun that follows it in a hyphenated compound. For instance, when describing a time period, one should say 'a thirty-day month', not 'a thirty-days month'.

He signed a comprehensive thirty-year mortgage for his new house.

Compound Adjectives
When a number and a noun form a compound adjective before another noun, the included noun remains singular.
Lastly, some non-native speakers struggle with the initial 'th' sound, substituting it with a 't', 'd', or 's' sound, resulting in pronunciations like 'tirty', 'dirty', or 'sirty'. Practicing the correct tongue placement—lightly pressing the tip of the tongue against the back of the upper front teeth while blowing air—is vital for achieving a clear and accurate pronunciation.

Practicing the pronunciation of thirty helped her improve her overall English accent.

The recipe calls for exactly thirty grams of fine caster sugar.

By being mindful of these common pitfalls regarding pronunciation, spelling, and grammatical structure, learners can confidently and accurately incorporate this essential number into their daily English usage.
While thirty is a specific, exact numerical value representing the quantity of three tens, there are various ways to express similar concepts or approximate quantities in the English language depending on the context. One of the most direct alternatives when discussing numbers is to use fractions or multiples of other numbers. For example, instead of saying thirty, one might refer to it as 'half of sixty' or 'three tens', though these are mostly used in mathematical explanations or riddles rather than everyday conversation.
Dozen Multiples
Sometimes, quantities close to thirty are expressed using dozens, such as 'two and a half dozen', which exactly equals thirty.

The baker prepared two and a half dozen cookies, which equals exactly thirty cookies.

When talking about time, specifically minutes past the hour, the word thirty has a very common alternative: 'half past'. This phrase is deeply ingrained in British English and is also widely understood in American English.
Time Alternatives
Instead of saying 'six thirty', you can say 'half past six' to convey the exact same meaning regarding the time of day.

The meeting is scheduled to begin at half past two, or two thirty.

When people want to express an approximate number around thirty, they often use phrases like 'around thirty', 'about thirty', 'roughly thirty', or 'thirty-something'. The term 'thirty-something' is particularly common when referring to a person's age if you know they are in their thirties but do not know their exact age.

The new manager is a highly energetic thirty-something professional with great ideas.

Approximations
Words like 'approximately', 'nearly', and 'almost' are frequently paired with thirty to give an estimate rather than an exact count.

We expect approximately thirty guests to attend the charity dinner tonight.

In historical contexts, the term 'thirties' is used as an alternative to saying 'the years between 1930 and 1939'. While there are no direct synonyms for the exact integer thirty, understanding these related phrases, approximations, and contextual alternatives greatly enriches your vocabulary and allows for more flexible, natural expression.

He spent nearly thirty years working diligently in the same factory.

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レベル別の例文

1

I am thirty years old.

State your age using the verb 'to be'.

Use the verb 'am' with 'I' and the plural noun 'years'.

2

The time is ten thirty.

Expressing time digitally.

When reading digital time, state the hour then the minutes directly.

3

This book costs thirty dollars.

Stating the price of an item.

Use the plural noun 'dollars' after the number thirty.

4

There are thirty students in my class.

Stating the quantity of people in a room.

Use 'There are' for plural nouns like 'students'.

5

I have thirty apples in the basket.

Counting physical objects.

The noun 'apples' must be in its plural form.

6

My house is number thirty.

Giving a street address.

Numbers used as identifiers do not make the preceding noun plural.

7

Please open your book to page thirty.

Following classroom instructions.

When referring to a specific page, the number follows the noun.

8

We wait for thirty minutes.

Expressing a duration of time.

Use the preposition 'for' to indicate duration.

1

My mother is thirty-five years old.

Using compound numbers for age.

Use a hyphen when writing compound numbers like thirty-five.

2

The train arrives in thirty minutes.

Talking about future schedules.

Use the preposition 'in' to mean 'after a period of'.

3

September has exactly thirty days.

Stating facts about the calendar.

The verb 'has' agrees with the singular subject 'September'.

4

I bought thirty eggs at the supermarket.

Purchasing quantities of groceries.

Ensure the noun 'eggs' is pluralized correctly.

5

The speed limit here is thirty.

Discussing driving rules.

The noun 'miles per hour' is often implied and omitted.

6

She needs thirty more points to win the game.

Discussing scores in a game.

Use 'more' after the number to indicate an additional required amount.

7

There is a thirty percent discount on these shoes.

Talking about shopping sales.

The word 'percent' remains singular even after a plural number.

8

I usually wake up at six thirty in the morning.

Describing daily routines.

Use the preposition 'at' before specific times.

1

He is in his early thirties and works as an engineer.

Describing an approximate age range.

Use the plural 'thirties' with a possessive pronoun to indicate an age decade.

2

We have a thirty-minute break for lunch today.

Using numbers as compound adjectives.

When used as an adjective, 'thirty-minute' is hyphenated and singular.

3

The temperature reached thirty degrees Celsius yesterday.

Discussing weather and temperature.

The noun 'degrees' must be pluralized.

4

I have been waiting here for almost thirty minutes.

Expressing frustration over duration.

Use 'almost' to indicate a number slightly less than thirty.

5

My grandparents were born in the nineteen thirties.

Referring to a historical decade.

Decades are pluralized, often written with an 's'.

6

The recipe requires exactly thirty grams of butter.

Following precise cooking measurements.

Measurements require the plural form of the unit, like 'grams'.

7

She has visited over thirty different countries in her life.

Expressing a large quantity of experiences.

Use 'over' to mean 'more than' a specific number.

8

The tennis player is currently leading thirty to fifteen.

Announcing a sports score.

In scores, the numbers are stated sequentially.

1

The bank offered them a thirty-year fixed-rate mortgage.

Discussing complex financial products.

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