OvercomeGradually he allowed himself to be overcome with enthusiasm.渐渐地,他也变得热情高涨了.这里的 overcome为什么不是overcame?

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Overcome
Gradually he allowed himself to be overcome with enthusiasm.
渐渐地,他也变得热情高涨了.
这里的 overcome为什么不是overcame?

be后面用过去分词表被动.
The food was eaten,不说was ate,对吗?

overcome的被动形式就是 OVERCOME
OVERCAME是过去式。

因为overcome的时态为:
现在分词--overcome 过去式--overcame 过去分词--overcome
这句的动词是被动,需用过去分词表被动