FCE 必考！6 大高频易错短语（错误率 90%）
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"I used to play piano when I was ten." — 你写对了，阅卷老师点头；"She should have told me earlier." — 语法精准，B2 级逻辑跃然纸上；"You needn't have waited — I arrived on time!" — 这一句，直接拉开与 A2/B1 考生的差距。
但考场真实一幕是：一位 FCE 考生在 Writing Part 1（邮件）中写道：I should have known that before ✅，下一行却写：I needn't to wait ❌——瞬间扣掉语法分。
今天这 6 个 FCE 高频易错短语，必须掌握！每组都配有真题例句和评分标准，看完再也不丢分！
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第 1 组：used to do（过去常常）
used to /ˈjuːst tuː/ + 动词原形
用法：过去长期、重复的习惯或状态（现已终止）
I used to live in Shanghai.
— 我过去住在上海（现在不住了）。
He used to smoke, but he quit in 2020.
— 他过去抽烟，但 2020 年戒了。
⚠️ 易错点：
❌ I used to watch a movie yesterday（错！yesterday 是单次过去时间）
✅ I watched a movie yesterday
❌ Did you used to play football?（错！疑问句用 use to）
✅ Did you use to play football?
第 2 组：be used to doing（习惯于）
be used to /biː ˈjuːst tuː/ + 动名词 doing
用法：已经习惯的状态（to 是介词，后接 doing）
She is used to getting up early.
— 她习惯早起了（已经习惯的状态）。
They aren't used to eating spicy food.
— 他们不习惯吃辣。
记忆技巧：be used to = 已经是习惯，to 后面接名词或 doing。
第 3 组：get used to doing（逐渐习惯）
get used to /ɡet ˈjuːst tuː/ + 动名词 doing
用法：从"不习惯"到"习惯"的过程（to 是介词，后接 doing）
It took me a month to get used to driving on the left.
— 我花了一个月才习惯靠左行驶（从不会到会的过程）。
You'll soon get used to the new schedule.
— 你很快就会适应新时间表的。
⚠️ used to 家族核心区别：
used to do = 过去常常（现在不了）→ 后接动词原形
be used to doing = 习惯于（状态）→ 后接 doing
get used to doing = 逐渐习惯（过程）→ 后接 doing
第 4 组：should have done（本应该做）
should have + 过去分词
用法：本应该做却没做（表达后悔、责备或合理推测）
You should have checked the weather forecast.
— 你本应该查天气预报的（暗示结果淋雨了）。
I should have called her yesterday.
— 我本应该昨天给她打电话的（但没打）。
第 5 组：shouldn't have done（本不该做）
shouldn't have + 过去分词
用法：本不该做却做了（表达批评或后悔）
She shouldn't have said that in front of her boss.
— 她本不该在老板面前说那话（但她说了）。
I shouldn't have eaten so much cake.
— 我本不该吃那么多蛋糕的（但吃了）。
⚠️ 易错点：
❌ I should have went to bed early（错！went 是过去式）
✅ I should have gone to bed early（should have + 过去分词）
第 6 组：needn't have done（本不必做）
needn't have + 过去分词
用法：本不必做却做了（已做，但事后证明多余）
You needn't have bought so many snacks — we ordered pizza!
— 你本不必买这么多零食的（但买了），我们点了披萨！
He needn't have worried; everything went smoothly.
— 他本不必担心的（但担心了），一切都很顺利。
对比：didn't need to + 动词原形
用法：不必做（没说做没做，动作未明确）
I didn't need to go to work yesterday.
— 我昨天不必去上班（可能去了，也可能没去）。
⚠️ 核心区别：
needn't have done = 做了但多余
didn't need to do = 不必做（动作未明确）
❌ You needn't to wait（错！needn't 后直接加动词原形）
✅ You needn't wait（现在不必等）
✅ You needn't have waited（当时不必等，但等了）
真题实战：FCE Writing Part 1 邮件
✅ 满分范文片段
"Thanks for your help with the project! I should have asked you sooner — my notes were incomplete. And don't worry about the presentation tomorrow: you needn't have prepared extra slides, as the teacher said we'll only show our main findings. By the way, I used to work at that café near school — it's still open!"
评分依据：
Grammar (5/5)：三个结构全部正确，时态逻辑严密
Discourse (4/5)：自然衔接，口语化但得体
Lexical Resource (4/5)：avoid repetition — 高分关键
小练习
选 3 组短语各造一个句子，发到评论区，我会逐一批改！
觉得有用，记得分享给需要的人！
评论区打卡：今天学会了哪几组短语？
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