1
need to do sth
表示主语有做某事的必要。
I need to finish my homework.
我需要完成作业。
需要；迫切想要
needing — present participle of need
先理解核心含义，再看它在真实句子里的用法。
需要；迫切想要
To have an absolute requirement for; to want strongly.
I need to finish my homework.
我需要完成作业。
绝对需要。
To have an absolute requirement for.
强烈想要；觉得必须拥有某物。
To want strongly; to feel that one must have something.
必须或应该(做某事)。
To be obliged or required (to do something).
是必要的；必须存在。
To be required; to be necessary.
need
Base
原形
needs
3rd person
第三人称单数
needing
-ing
现在分词
needed
Past
过去式
needed
Past participle
过去分词
I need a new book.
我需要一本新书。
She needed help yesterday.
她昨天需要帮助。
They have needed more time.
他们一直需要更多时间。
规则动词，注意第三人称单数加-s，过去式和过去分词加-ed。
She needs to finish her homework before dinner.
她需要在晚餐前完成作业。
I needed a new phone because my old one broke.
我需要一部新手机，因为旧手机坏了。
You need to drink more water every day.
你每天需要喝更多的水。
表示主语有做某事的必要。
I need to finish my homework.
我需要完成作业。
表示需要某人做某事。
She needs her assistant to prepare the report.
她需要她的助理准备报告。
主动形式表示被动意义，相当于need to be done。
The car needs washing.
这辆车需要洗了。
Not this
He need go.
Use this
He needs to go.
动词need作实义动词时，后接带to的不定式，且第三人称单数需加-s。中文中无此变化，故易漏。
Not this
I need study English.
Use this
I need to study English.
need作为实义动词，必须跟to不定式，不能直接跟动词原形。中文中‘需要’后可直接接动词，导致错误。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
需要做；必须做
You need to see a doctor about that cough.
你需要去看医生，看看你的咳嗽问题。
需要帮助
If you need help, please let me know.
如果你需要帮助，请告诉我。
需要休息一下；需要喘口气
We've been working all morning; I think we need a break.
我们已经工作了一上午，我觉得我们需要休息一下。
需要更多时间
She needs more time to prepare for the exam.
她需要更多时间准备考试。
需要被做；有待…
The floor needs cleaning.
地板需要清洁。
急需；非常需要
After the long trip, I badly need a shower.
长途旅行之后，我非常需要洗个澡。
如果需要的话；有必要时
If need be, we can stay an extra day.
如果需要的话，我们可以多待一天。
需要
The car is in need of a new battery.
这辆车需要换新电池。
患难见真情
When I lost my job, my best friend lent me money — a friend in need is a friend indeed.
当我失业时，我最好的朋友借钱给我——患难见真情。
你所需要的只是爱。
The Beatles sang, 'All you need is love.'
披头士乐队唱道：“你所需要的只是爱。”
我需要一个英雄。
Bonnie Tyler's song begins, 'I need a hero.'
邦妮·泰勒的歌开头唱道：“我需要一个英雄。”
发长 /iː/ 音 (如 see, free)
Use needing naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
看到“need”就想起它的长词“needle”（针）：缝补时你需要（need）一根针。
语域：neutral 常见场景：日常交流、正式文本、职场沟通 need 作实义动词表示‘需要’或‘必须做某事’时，通常属于中性语体，在日常对话和书面表达中都比较常见。若表示‘必须做某事’，need to do 多用于一般性义务或必要性说明，语气较委婉，正式与非正式场合均适用。
need can be used as a main verb or a modal verb; as a main verb, it takes a direct object or a to-infinitive; as a modal verb, it is used in negative and interrogative sentences without 'to'.
Dictionary facts from ECDICT, WIKTIONARY.