你曾经骑过骆驼吗?
have been句型是现在完成时,表示1从过去持续到现在的动作,2发生在过去但是对现在有影响的动作.
句型用have/has(单数人称时）+过去分词
过去分词一般是在动词后面加ed,但是也有不规则的动词变位,这里的ridden就是不规则动词的变位,原形是ride
英语达人进!have you ever ridden a camel?
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