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基数词 Cardinal
There are fifty students.
有50个学生。
1-12独立;13-19加teen;20-90加ty;⚠具体数字后不加s
📋 更多例子序数词 Ordinal
He won first prize.
他得了第一名。
1st/2nd/3rd特殊;其余加th;ty变tieth;缩写数字+最后两字母
📋 更多例子1
There are ___ (hundred) of birds in the sky.
hundredshundredtwo hundreds
✅ hundreds of固定→加s！
❌ hundreds of→加s；具体数字two hundred→不加s！
2
Today is my ___ (twenty) birthday.
twentiethtwentythtwentith
✅ twenty→twentieth！y变ieth。
❌ twenty变序数词→twentieth！
💡 口诀
"具体数字不加s，of短语要加s；序数词缩写看最后两字母"
分数 Fractions
Two thirds of the students are boys.
三分之二的学生是男生。
分子基数+分母序数;分子>1→分母加s
📋 更多例子百分数 %
Eighty percent of the water is clean.
80%的水是干净的。
数字+percent;of后名词定单复
📋 更多例子小数 Decimals
3.14 → three point one four
3.14→三点一四。
point逐位读;0读zero
📋 更多例子3
___ (3/5) of the earth's surface ___ (be) water.
Three fifths,isThree fifth,areThree fifths,are
✅ 3/5→分母加s→Three fifths！surface单数→is。
❌ 分子>1分母序数词加s→fifths；of后surface单数→is！
4
Seventy percent of the population ___ farmers.
areisbe
✅ population指人→复数→are！
❌ population指具体人群→复数→are！
and / both...and
He is kind and smart.
他既善良又聪明。
并列/递进;both...and谓语复数
📋 更多例子but / yet / while
She is young but wise.
她年轻但聪明。
but=但是;yet=然而;while=而(对比)
📋 更多例子or / either...or
Hurry up, or you'll be late.
快点，否则会迟到。
选择/否则;either...or就近
📋 更多例子so / for
He was tired, so he went to bed.
他累了，所以睡了。
so=所以;for=因为(补充)
📋 更多例子neither...nor
Neither he nor I am right.
他和我都不对。
两者都不;谓语就近
📋 更多例子5
___ you ___ he is right. Neither of you has thought it through.
Neither,norEither,orBoth,and
✅ neither...nor→两者都不！谓语就近→he→is。
❌ 两者都不→neither...nor！
6
Be quick, ___ you will miss the bus.
orandbut
✅ 祈使句+or→否则！固定句型。
❌ 否则→or！祈使句+or+陈述句。
1
There are ___ (thousand) of stars in the sky.
thousandsthousandtwo thousand
✅ thousands of→加s！
❌ thousands of→加s！
2
About ___ (3/4) of the work has been finished.
three fourthsthree fourththird four
✅ 分子>1→分母序数词加s→three fourths！
❌ 3/4→three fourths！
3
She is not only a singer ___ also a dancer.
butandor
✅ not only...but also→固定搭配！
❌ not only...but also！
4
___ my mother ___ my father likes spicy food. They both prefer light flavors.
Neither,norBoth,andEither,or
✅ both prefer light→都不喜欢辣→neither...nor！
❌ 两者都不喜欢→neither...nor！
5
He is over seventy, ___ he still goes jogging every morning.
yetandso
✅ 七十多 vs 每天跑步→转折→yet！
❌ 年龄大但仍锻炼→yet！
6
I was about to leave ___ the phone rang.
whenandbut
✅ be about to...when→正要…这时→when！
❌ be about to do...when→固定句型！
"具体数字不加s"|"of短语要加s"|"and并but转so因果"
2023·全国甲
____ (hundred) of volunteers took part in the activity.
HundredsHundredTwo hundreds
✅ hundreds of→加s！
❌ hundreds of→加s！
2022·新高考I
He was exhausted, ___ he still managed to finish the work.
butandso
✅ exhausted vs finish→转折→but！
❌ 累但完成→but！
2022·全国乙
It's never too late to learn, ___ she started college at sixty.
forbutso
✅ 补充说明原因→for！
❌ 补充说明→for "因为"！