Prevent，阻止、阻碍、阻挠。Pvent doing sth，阻止做某事。Pvent sb from doing sth，阻止某人做某事。Pvent通常会接所有格形容词+动名词或接受词+from+动名词。当主词没有必要列出时，Pvent可以直接接动名词，也可以接名词。
Pvent例句
You can't Pvent my leaving.
You can't Pvent me from leaving.
I want to Pvent his getting sick.
I want to Pvent him from getting sick.
This campaign is designed to Pvent drowning.
Preventing stealing is our main goal this year.
We are working to Pvent forest fires.
This vaccine will Pvent malaria.
Pvent sth/sb from doing sth
from可用可不用。使用from，则句型为主谓宾+介词短语作状语（现代语法称这个介词短语为动词的补足语）。
不用from，则句型为主谓宾结构，动名词复合结构作宾语。动名词的逻辑主语为代词时，正式语体用所有格表示，非正式语体用宾格表示。
