be needful for sth
for表示用途
Food is needful for survival.
食物是生存所需的。
需要的；必要的；必需的；不可或缺的。
needed; necessary; essential
需要的；必要的；必需的；不可或缺的。
Needed; necessary; mandatory; requisite; indispensable.
The committee will provide all needful documents for the application.
委员会将提供申请所需的所有文件。
用法提示：needful 作定语修饰 documents，表示“必要的”。
It is needful to check the facts before making a decision.
在做决定之前有必要核实事实。
用法提示：needful 作表语，后接不定式，表示“有必要的”。
The needful precautions have been taken to ensure safety.
为确保安全已采取必要的预防措施。
用法提示：needful 作定语修饰 precautions，表示“必要的”。
for表示用途
Food is needful for survival.
食物是生存所需的。
不定式作主语
It is needful to rest.
休息是必要的。
that从句
It is needful that we leave now.
我们现在离开是必要的。
grammar · medium
易错句子The charity helps needful families.
正确表达The charity helps needy families.
混淆了'needful'和'needy'，前者意为'必要的'，后者意为'贫穷的'。此处表示贫穷的家庭应用'needy'。
grammar · medium
易错句子Please do the needful.
正确表达Please do what is necessary.
将'needful'作名词使用是错误的，因为它是形容词。应改用'what is necessary'或'the necessary things'。
needful意为‘所需的’，而needy指‘贫困的’; 两词拼写相似但含义不同。
needful 强调因需求而必须，常用于正式或法律语境；necessary 更通用。
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