percent
percent — adverb
1. used after a number to show how many parts there are in each hundred, whether wr
used after a number to show how many parts there are in each hundred, whether written in words or with the sign %.
Only 12 percent of the class brought raincoats to school today.
number + percent of + noun
Gas prices rose 5 percent after the holiday weekend.
rise + number + percent
About 70 percent of the island's land is covered by mountains.
The phone battery was still at 30 percent after two hours.
- per cent
the traditional two-word spelling, especially common in British English
- out of every hundred
a plain explanatory phrase rather than a compact label
- in every hundred
used when explaining the idea in full words
文法句型
number + percent + of + noun
rise/fall + number + percent
be at + number + percent
用法筆記
Follows an exact number and commonly appears with 'of' before the group or whole being measured. In British writing, the two-word spelling 'per cent' is also common.
常見錯誤
2. used, especially with 100, to mark how strong your certainty, agreement, or beli
used, especially with 100, to mark how strong your certainty, agreement, or belief is about something being true.
I'm 100 percent sure Leo left his keys on the kitchen table.
100 percent + sure
Rina does not 100 percent agree with the new school rule.
100 percent + agree
The coach is 90 percent certain Maya can play on Saturday.
After hearing both sides, the judge was not 100 percent convinced.
- definitely
fits certainty, but not exact agreement percentages
- certainly
formal or neutral marker of strong belief
- fully
works especially with 'agree', not with all certainty statements
- doubtfully
rare and stylistically marked opposite showing doubt
- partly
used when agreement or confidence is incomplete
文法句型
100 percent + sure/certain/convinced
100 percent + agree
number + percent + sure
用法筆記
Most common with '100 percent' and words such as 'sure', 'certain', 'agree', and 'convinced'. Distinguish from sense 3: this sense grades belief or agreement, rather than saying something is complete in itself.
常見錯誤
3. used for strong emphasis to say that something is complete, total, or leaves no
used for strong emphasis to say that something is complete, total, or leaves no room for doubt.
This soup is 100 percent vegetarian, so Ken can eat it.
100 percent + adjective
By Friday, the team was 100 percent ready for the final.
Maria is 100 percent behind the plan to plant more trees.
After the long storm, the cotton sheets were 100 percent dry.
- completely
neutral adverb for total degree
- totally
informal and close in tone
- absolutely
often adds strong personal emphasis
文法句型
100 percent + adjective
100 percent + past participle
be 100 percent behind + noun
用法筆記
Common in speech and informal writing with adjectives, past participles, and phrases like 'behind the plan'. Distinguish from sense 2 when the speaker is not measuring confidence or agreement, but stressing completeness.
常見錯誤
percent — noun
1. a single share when a whole is divided into one hundred equal parts.
a single share when a whole is divided into one hundred equal parts.
In today's maths class, one percent of 300 was three.
one percent of + number
The label said one percent of the drink was added sugar.
Even a one percent error can change the final bill.
The baker mixed salt equal to one percent of the flour.
- one hundredth
the exact mathematical equivalent
- hundredth
shorter math term, often used in teaching
文法句型
one percent of + number
a one percent + noun
用法筆記
Most often appears in calculations or exact descriptions of small amounts. Distinguish from sense 2, which focuses on the rate or share being reported, not on one exact hundredth unit.
常見錯誤
2. the figure that shows what share of a total something makes when it is counted o
the figure that shows what share of a total something makes when it is counted on a scale of one hundred.
What percent of local families own a car?
what percent of + noun
A high percent of voters supported the new mayor.
A low percent of trains were late after the bridge reopened.
Only a small percent of the oranges were damaged.
- percentage
more general noun, especially common in formal writing
- proportion
broader word that does not have to be based on 100
- share
everyday word for a part of the whole
文法句型
what percent of + noun
a small/high/low percent of + noun
a high/low percent of + noun
用法筆記
Common in American English, especially after 'what', 'high', and 'small'. British English and formal writing often prefer 'percentage' for this noun sense.
常見錯誤
percent — adjective
1. describing an amount, change, or chance stated as a number out of one hundred be
describing an amount, change, or chance stated as a number out of one hundred before a noun.
The store offered a 20 percent discount on winter coats.
number + percent + noun
The forecast gave us a 70 percent chance of rain.
Workers rejected the company's 3 percent pay offer last month.
A 15 percent rise in rent forced Mina to move.
- percentage
appears in phrases like 'percentage change', but is less common before a number
- proportional
broader and more formal; not limited to a scale of 100
文法句型
number + percent + noun
a number percent chance/rise/cut
用法筆記
Used before nouns such as 'discount', 'chance', 'rise', and 'cut', usually after a number. After the verb 'be', English normally switches to the noun or adverb pattern instead.