many people try to climb the mountain but do not succeed=many peo_英语解答

many people try to climb the mountain but do not succeed
=many people try climbing the mountain,but they____

人气：339 ℃　时间：2019-08-20 16:24:48

解答

failed.
failed=not succeed
不成功,失败failed是过去式还是形容词？是动词的过去式原型fail为什么需要过去式，上文不也是do吗？