
需要做…
How much money do we need to do the job properly?
我们需要多少钱才能做好这件事?
All you need to do is upload the files on to your web space.
你所需要做的只是把文件上传到你的网络空间。
What kind of tests do we need to do?
我们需要做什么样的检验呢?
They need to shift from farming to industry, and they need to do so desperately.
他们需要从农业领域转移到工业领域,并且他们需要拼命地那么做。
We need to do whatever we can do to prevent further damage to our natural environment.
我们需要竭尽所能来防止对自然环境造成更大损害。
"need to do"是英语中常见的情态动词短语结构,表示"需要做某事"的客观必要性或主观责任。该表达由动词need加不定式符号to构成,具有以下语言学特征:
必要性表达 作为半情态动词,need to do强调客观存在的需求或义务。例如:"Doctors need to update medical knowledge regularly"(医生需要定期更新医学知识)。区别于must的主观强制性,need to更侧重客观要求。
语法结构 其否定形式为"do/does/did not need to",疑问句需添加助动词。例如:"Does this medication need to be refrigerated?"(这种药物需要冷藏吗?)。在英式英语中,否定可用"needn't do"替代。
语用功能 常用于正式场合表示职责要求,如法律文书:"Applicants need to submit original documents"(申请人需提交原始文件)。在美式英语中,该表达使用频率显著高于need doing结构。
语义辨析 与have to do相比,need to do更强调必要性而非强制性。根据Longman Dictionary of Contemporary English的释义,当主语为无生命物体时,只能用need to do结构,如:"The system needs to reboot"(系统需要重启)。
该短语在COCA语料库(当代美国英语语料库)中的使用频率达每百万词频327次,显示其作为核心表达的地位。实际应用中需注意:第三人称单数需加-s,否定疑问需借助助动词,时态变化通过need本身实现。
“need to do”是一个常见的英语短语,其核心含义是“需要做某事”,表示“有义务、必要性或责任去完成某个动作”。以下是详细解析:
You need to study for the exam.(你需要为考试复习。)
Need I go now?(情态动词,正式用语)
You needn’t worry about it.(情态动词,否定形式)
Do you need to leave so early?(实义动词疑问句)
Plants need to get sunlight to grow.(植物需要阳光生长。)
We need to submit the report by Friday.(周五前必须提交报告。)
You need to check your email regularly.(建议对方及时查邮件。)
She needed to explain the situation.
We will need to confirm the details later.
❌ He need to go.(应为实义动词:He needs to go 或情态动词:He need not go)
The car needs washing = The car needs to be washed.
“need to do”强调主动、具体的必要性,适用于大多数日常和正式场景。需注意其与情态动词“need”的语法差异,避免混淆。
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