prevent是一个常用的动词，它的意思是“防止，预防”。在英语中，prevent常常和一些固定搭配一起使用，这些搭配对于学习英语的人来说非常重要。下面我们来看一些常见的prevent固定搭配。

1. prevent sb. from doing sth.

prevent sb. from doing sth.是prevent最常用的搭配之一，意思是“阻止某人做某事”。例如：

- The rain prevented us from going out for a picnic.

- The teacher prevented the students from cheating during the exam.

2. prevent sth. (from) happening

prevent sth. (from) happening是指“防止某事发生”，(from)可以省略。例如：

- Regular exercise can prevent heart disease.

- The security measures prevented any thefts from happening.

3. preventative measures

preventative measures是指“预防措施”，指为了防止某事发生而采取的措施。例如：

- The government is taking preventative measures to stop the spread of the virus.

- Wearing a helmet while cycling is a preventative measure to reduce head injuries.

4. preventable

preventable是一个形容词，意思是“可以预防的”，表示某事是可以通过采取预防措施来避免的。例如：

- Many car accidents are preventable if drivers follow traffic rules.

- Childhood diseases are preventable with proper vaccination.

5. prevent sb. (from) doing sth. by force

prevent sb. (from) doing sth. by force是指“强制阻止某人做某事”，表示通过暴力或强制手段来防止某人做某事。例如：

- Police prevented the protesters from entering the government building by force.

- The soldiers prevented the enemy from crossing the border by force.

以上是prevent常见的几个固定搭配，学好这些搭配可以帮助我们更好地理解和应用prevent这个单词。