He fail to catch the train.He fail to lift the rock in spite of all his exertion.请问这两句话fail为何不加s?

He fail to catch the train.He fail to lift the rock in spite of all his exertion.请问这两句话fail为何不加s?

题目
He fail to catch the train.He fail to lift the rock in spite of all his exertion.请问这两句话fail为何不加s?
答案
因为是错的.应该加ed,过去时,he failed to ...加s一般时有点别扭
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