many thousands of people have been infected with the virus.为什么infect要加ed,是因为他是被动语态吗?凡是被动语态动词都要加ed吗?

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manythousandsofpeoplehavebeeninfectedwiththevirus.为什么infect要加ed,是因为他是被动语态吗?凡是被动语态动词都要加ed吗?manythousa

many thousands of people have been infected with the virus.为什么infect要加ed,是因为他是被动语态吗?凡是被动语态动词都要加ed吗?
many thousands of people have been infected with the virus.
为什么infect要加ed,是因为他是被动语态吗?凡是被动语态动词都要加ed吗?

many thousands of people have been infected with the virus.为什么infect要加ed,是因为他是被动语态吗?凡是被动语态动词都要加ed吗?
这里infect是用的被动形式,所以加ed,人做主语,被病毒感染.
所有的被动都要用对应恶过去分词,不过由于特殊情况和不规则变化,并不是简单的加ed