claim和demand和require的区别？ | 果壳网移动版

后面直接接名词宾语时：

claim和demand的意思是“索要”。前者一般用于索赔等场合，后者则是一种强势的、咄咄逼人的索要。require的意思是“需要”、“要求”，不是描述一种行为，而是一种事实上的需求。

例如：
The customer claimed a refund.
The boss demanded an apology from me.
This website requires the Chrome browser.

后面接宾语从句时：

claim的意思有变化，变成了“声称”。另外二者意思不变。注意后两者的宾语从句要用虚拟语气，即动词用原形（或前面加should）。
例如：
The doctor claimed that his medicines were effective.
The boss demanded that I make an apology.
This website requires that your computer have the Chrome browser.

demand和require还可以用v sb to do sth的句型：

The boss demanded me to make an apology.
This website requires your computer to have the Chrome browser.